Derailleur
n. <法>(自行车)变速器, 装有变速器的自行车
🗣️ 情景例句
I think I'll need your expert assistance this afternoon.
我想，我今天下午需要你专业的协助。
And what's that?
还有那是什么？
if it is really attended by the illumination of another field of interest,
而且的确受到别的领域的情趣的启迪，