Acetylenes
(acetylene 的复数) n. 乙炔, 电石气\\n[化] 乙炔; 双亚乙基
🗣️ 情景例句
Well, we'll phone every hour,
好了， 我们每个小时都打电话
How long have you had this pain?
疼痛多久了？
They can't pick up the small pieces with their fingers.
他们用手指拿不起小零件。