名词
中文翻译：自行车
同义词：
['bicycle', 'two-wheeled bicycle']
例句：
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1. He rode his bike to school every day.
他每天骑自行车上学。
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2. The children are learning to ride their bicycles.
孩子们正在学习骑自行车。
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3. Bicycles are a popular form of transportation in many cities.
自行车是许多城市流行的交通工具。