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
Now, once you put the ring on Susan's finger,
现在， 你一旦将戒指戴上Susan的手指，
He seems to have a lot of strange ideas.
他似乎有很多奇怪的想法。
Sally was very excited because she had never travelled on a train before.
萨莉非常激动，因为她从未乘过火车。