Geartrain
un. 齿轮系列；传动机构\\n
🗣️ 情景例句
Don't worry. You'll get used to it in no time.
别担心，你会很快习惯的。
You haven't been around much lately,have you?
你近来不大出来走动了，是吧？
Is this a pencil?
这是一支铅笔吗？