For sheds without rolling shutters, it is best to stand in the center of the greenhouse with a person dedicated to rake the haystacks. When we put down a haystack, we stand in the middle of the haystack. When the second haystack is placed in the center, we stand on the second bed, and so on. When we put down the last haystack, we should use it. The heavier items such as bricks will press the westernmost grasshopper, and then grasp the time to cover the film. The film will be pressed and the grasshopper will not be scraped. For a shed with a roller shutter installed, simply turn on the switch and when the grasshopper is lowered, one person needs to press a heavier item such as a brick on the western side of the shed, and wait until the haystack is released. The westernmost grasshopper pressed on a row of bricks and then covered the film in time. The general problem was not serious.
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