Reciprocating motion
[机] 往复运动
🧩 词语组成解析
[医] 交互的, 往复的
motion
['məuʃən]
n. 运动;手势;动机，意向;请求;
vt. 打手势;向某人点头或摇头示意;打手势要求[指示];
vi. 运动;打手势;
🗣️ 情景例句
I do his taxes every year.
我每年为他处理税务。
My brother wants to learn how to sail a boat.
我的兄弟要去学操纵帆船。
Wu dropped his stick! He stopped to get it and of course fell behind.
吴的接力棒掉地了！他停下捡棒，当然就落后了。