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....
选派 他扮演哈姆雷特的角色.He was cast as [ for the part of ] Hamlet.导演选派我扮演科学家.The director cast me as a scientist.选派他扮演奥赛罗的角色.He was cast as Othello / cast in the role of Othello....
我们在人陪同下穿过一条低矮的门道。We were escorted through a low doorway.小孩无人陪同不允许走出这个地方。Unescorted children are not allowed beyond this point.儿童必须要有大人陪同。Children must be accompanied by an adult....