题目内容
液压执行元件包括液压缸和液压马达两大类型
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齿轮泵可以直接做液压马达使用
You might look a little ridiculous holding your smartphone on the end of a stick ________________________________ (在旁观者看来), but at least your photos and videos turn out fabulous.
Wear your hiking shoes and _______________________ (出发去雨林)and other scenic zones of this country.
On the Williamsburg Bridge, pedestrians have their own walkway. It’s a much nicer walk and you don’t have to worry about ________________________ (被骑自行车的人撞倒).
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