Solar water purifier ( SW40): Đề thi thật IELTS LISTENING Vol 2 Test 8 Section 4 (IELTS Listening Recent Actual Test) - Kèm đáp án, transcript + giải thích từ vựng

Bên cạnh PHÂN TÍCH ĐỀ THI THẬT TASK 2 (dạng advantages & disadvantages) Some students work while studying. Discuss the advantages and disadvantages of this trend and give your opinion?NGÀY 04/8/2020 IELTS WRITING GENERAL MÁY TÍNH (kèm bài được sửa hs đi thi), IELTS TUTOR giới thiệu Solar water purifier ( SW40): Đề thi thật IELTS LISTENING Vol 2 Test 8 Section 4 (IELTS Listening Recent Actual Test) - Kèm đáp án, transcript + giải thích từ vựng

Question 31-36
Complete the sentences below
Write NO MORE THAN TWO WORDS AND/ OR A NUMBER for each answer

Solar water purifier ( SW40)

31 high levels of................. Make bore water unsafe to drink.
32 The Sw40 produces water that is so pure it can be used in.................
33 one problem with the present method of production of the Sw is that it is quite...................
34 the speaker hopes to acquire financial support from an agency called.................

35 the Sw40 has a maximum output of................. On a sunny day.
36 Each Sw40 produces enough water for a ............................>> IELTS TUTOR lưu ý: PHÂN TÍCH ĐỀ THI 30/5/2020"Some education systems make students focus on certain subjects at the age of 15, while others require students to study a wide range of subjects until they leave school. What are the benefits of each system? Which is better?"IELTS WRITING TASK 2 (kèm bài sửa HS đạt 6.5)

Questions 37-40
Label the diagram below
Write NO MORE THAN TWO WORDS AND/ OR A NUMBER for each answer.

31, Salts
32, Hospitals
33, Slow
34, Health International
35, 9
36, Family
37, Glass
38, 12.5
39, Germs
40, collection tank >> IELTS TUTOR lưu ý: PHÂN TÍCH ĐỀ THI THẬT TASK 2 (dạng advantages & disadvantages) Some students work while studying. Discuss the advantages and disadvantages of this trend and give your opinion?NGÀY 04/8/2020 IELTS WRITING GENERAL MÁY TÍNH (kèm bài được sửa hs đi thi)

00:00
Now turn to Section 4. Section 4. You will hear a lecturer giving a talk to design and technology students about a new device (thiết bị) which uses the sun to purify (làm sạch) water. First, you have some time to look at questions 31 to 40. Now listen carefully and answer questions 31 to 40. For many parts of the world today, a lack of clean drinking water is a major problem.

00:30
In some developing areas, bore (khoan) water, which is water that comes out of the ground, is the only water available. Unfortunately, bore water may be dangerous to drink because it contains excessive (quá mức) amounts of salts. In recent months, I've been working with a research team to develop a device (thiết bị) that will help solve this problem. What we came up with is a solar (năng lượng mặt trời) water purifier (máy lọc nước), which we have called the SW40.

01:01
And this device (thiết bị) not only makes bore water drinkable, it can even process (xử lý) sea water. In fact, it even passed the rigorous (nghiêm ngặt) testing standards applied by hospitals to determine whether water is sterile (vô trùng) enough for use there. The only problem we do face at the moment is with its manufacturing (sản xuất). The present method involves a process called vacuum forming (ép chân không), which tends to be rather slow.

01:29
We'd like to change to an injection (ép khuôn) motive (động lực) process, which is much faster, but would cost quite a lot to switch to, around one million Australian dollars. There are a number of private companies that are very keen to go into partnership (hợp tác) with us over this, but my preferred option would be a global aid agency (tổ chức viện trợ toàn cầu) known as Health International, that sponsors (tài trợ) projects like ours.

01:57
It has a long history of working in these areas, and although it may take a little longer to get an agreement, it should mean a better deal (thỏa thuận) all around. So, just how useful is this device (thiết bị) of ours? Well, the amount of pure water it is capable (có khả năng) of producing each day varies as the amount of sunlight available varies. However, on a hot day,>> Form đăng kí giải đề thi thật IELTS 4 kĩ năng kèm bài giải bộ đề 100 đề PART 2 IELTS SPEAKING quý đang thi (update hàng tuần) từ IELTS TUTOR

02:23
When the temperature is around about 25 to 30 degrees Celsius, with the sun shining clearly through a blue sky, it produces anywhere from 7 liters per day to as much as 9 liters. Now, most people can survive on 1 to 2 liters per day. So even under difficult (khó khăn) conditions, one family could live off one of these devices (thiết bị).

02:48
So a normal-sized village would require several of these to supply (cung cấp) all its needs. Okay, so let's look at the device (thiết bị) in more detail. It weighs 8 kilograms and is the size of a medium-sized suitcase. The SW40 has no filters (bộ lọc), no electronics, no moving parts (bộ phận chuyển động), and uses no chemicals. So how does it work?

03:14
Well, there's a rectangular box with a glass lid (nắp) on it. And on the edge of the box is a steel frame (khung) to hold everything together. And inside the box is a piece of black plastic which is divided (chia ra) up into pockets. You need an incline (độ nghiêng) so the water flows through the device. The optimum (tối ưu) is 12.5 degrees to the horizontal, although it can be one or two degrees above or below that.

03:44
Impure water is piped in (đưa vào qua ống) at the top of the box and flows down through the little pockets until they're all full. You then let Mother Nature, in the form of the sun, do its work as it shines through the glass window. It produces infrared light (ánh sáng hồng ngoại) which heats the water. At the same time, ultraviolet light (tia cực tím) from the sun, or UV as we more commonly call it, is also radiated (phát ra).

04:11
If there are germs (vi khuẩn) present in the water, prolonged (kéo dài) exposure to this type of light will kill them. Then, as the temperature of the water rises due to the sun's heat, the water vaporizes (bay hơi) and condenses (ngưng tụ) on the underside of the glass panel. The droplets (giọt nước) of water slowly run down the glass to a collection tank (bể chứa), ready to be taken away for drinking or whatever. So that's basically how it works. Now...

04:40
what this means. That is the end of section four. You now have half a minute to check your answers.

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