Train of wheels
[机] 齿轮系
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
n. 旋转；车轮（wheel的复数）
🗣️ 情景例句
It was very thoughtful of you to send flowers.
你送花来，想得真周到。
If the sky falls,we shall catch larks.
天垮正好抓云雀；不要杞人忧天。
I've lost my ruler. Have you seen it anywhere?
我的尺子丢了。你在哪看见了吗？