解析下面的句子
17. Trains are fast and convenient , but rush hours can be terrible.
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18. Tricycles are worth using if you want to explore the narrow alleys of old Beijing .
17 It is fast and convenient to take the trains, but it can be terrible taking the train during rush hours.
网友回答
(答案→)17 It is fast and convenient to take the trains, but it can be terrible taking the train during rush hours.
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