Dmk
[医][=demethylketene]脱甲基乙烯酮
🗣️ 情景例句
and I think he believes
而我认为他相信
The thunder rumbles.
雷声响起。
that people have for years assumed that the process of losing vigour with time,
多年来就已认识到。生命力随着时间流失而丧失活力，