Ketene
n. [化] 乙烯酮, 烯酮
🗣️ 情景例句
What's the problem?
是什么问题？
Would you care for a cop of coffee?
要被咖啡吗？
And if, with the decay of vitality, weariness increases,
再者，随着精力的衰退，老年人的疲惫感会增长，