The bicycle is a relatively recent invention. It is by far the most economical and environmentally friendly mechanical mode of t

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问题 The bicycle is a relatively recent invention. It is by far the most economical and environmentally friendly mechanical mode of transport yet invented. Describe how the illustrated two-wheeled bicycle below functions, and be sure to mention in your description the machine’s environmentally-friendly feature.
You should write no fewer than 120 words on the answer sheet.

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答案 As we know, bicycle is cheap, easy to operate, and convenient. Surely, it is one of the most useful transportations man has ever invented. As we can see in the picture, the saddle is designed to be of triangular shape, which makes the rider more c

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