Levulinic
乙酰丙
🗣️ 情景例句
Come on. You all helped.
别这样说。你们都帮了忙。
Americans wonder what has become of the idealism of the last decade.
美国人的理想主义，不知道在这十年间变得怎样了。
What a lot of smoke!
好浓的烟啊！