许多普通的骑自行车者抱怨，现在充斥街头的速度快、声音小的电动车对于其他通行者是一种威胁。
Many ordinary bike riders complain that the fast, silent electric bikes that now whizz about the city are a menace to other road users.
电动车容易启动，容易操作，噪音小， 无污染，而且无需多少保养。
The electric cars were easy to start and handle and were very quiet and clean and required comparatively little maintenance.
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