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
Really. I didn't like math.
真的。我不喜欢数学。
I went there on business.
我出差到那儿。
You're so careless.
你真粗心。