活塞上涂了一层石墨以减小摩擦力。The pistons are graphite-coated to reduce friction.咱们用车床车[加工]新的活塞吧.Let's get the lathe to turn the new piston.他们改用活塞发动机.They use a piston engine instead....
He closed down the business and went into politics.他关闭公司投身政治。The film takes no position on the politics of Northern Ireland.这部电影未在北爱尔兰政治问题上选择站边。But that doesn't mean this brand of politics is dead or dying.但那并不意味着这种...
That's where the shoe pinches.那就是困难所在.The coach said he wasn't worried about any position except quarterback; that was where the shoe pinches.教练员说除前场与中场的位置以外,他不担心其他别的位置; 前场与中场的位置是困难所在.The shoe pinches me.这鞋太挤脚....