bike表示自行车，脚踏车，摩托车等，可指任何骑行的工具；而bicycle可指自行车，单车等，一般指普通单车。bicycle是可数名词,基本意思是“自行车,脚踏车”,可指一辆具体的自行车,也可指抽象的交通工具。

相关介绍

It took her three hours to repair her bike.

她花了三个小时修理自行车。

I usually go to work by bike.

我通常骑自行车上班。

A bicycle came into sight on the main road.

大路上出现了一辆自行车。

A bicycle is often more convenient than a car in towns.

在城镇骑自行车常常比开车更方便。