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阅读回答问题:阅读下列短文，并根据所获取的信息用英语按要求回答问题。
Farmers use different kinds of soil protection methods to keep their land from being damaged by farming or the forces of nature. One important form of soil protection is the use of windbreaks. Windbreaks are barriers (障碍) formed by trees and other plants. Farmers plant these barriers around their fields.
There have been studies done on windbreaks in parts of West Africa, for example. They found that grain harvests can be twenty percent higher in fields protected by windbreaks ______________________ fields without such protection.
But windbreaks seem to work best when they allow some winds to pass through them. If the wall of trees and plants block the wind completely, the violent air motions (移动) will take place close to the ground. These motions will lift soil into the air where it will be blown away.
For this reason, a windbreak is best if it has only sixty to eighty percent of the trees and plants needed to make a solid line. An easy rule to remember is that windbreaks can protect areas up to ten times the height of the tallest trees in the windbreak. There should be at least two lines in each windbreak. One line should be large trees. The second line, right next to it, can be shorter trees and other plants with leaves. Locally grown trees and plants are best for windbreaks.
Windbreaks can stop the wind blowing soil away. They also keep the wind from destroying or damaging crops. They are very important for protecting grain crops.
Questions:  
1. List at least two advantages of windbreaks based on the text. (Please answer within 8 words.)
① ______________________________.  ② _________________________________.
2. What's the main idea of paragraph 4? (Please answer within 8 words.)
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3.Fill in the blank in paragraph 2 with proper words. (Please answer within 4 words.)
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4.Which sentence in the text is the closest in meaning to the following one?
If the wind can't pass through the windbreaks, the strong air movements will happen close to the ground.
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5.Translate the underlined sentence in paragraph 5 into Chinese.
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