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....
调整天线的位置和方向以达到最佳接收效果。Adjust the aerial's position and direction for the best reception.应该将盛行风的方向考虑在内。The direction of the prevailing winds should be taken into account.莫利笑话我糟糕的方向感。Molly razzed me about my rotten sens...