Tetronate
4-羟[基]乙酰乙酸内酯
🗣️ 情景例句
And be a true member of the Stewart family.
也真正成了Stewart家庭中的一员。
Yes, this is Shen speaking.
是的，我姓沈。
The most wonderful piece of machinery on show was Nasmyth's steam hammer.
其中最奇妙的是内史密斯的蒸汽锤。