Heptyne
庚炔 1-heptyne 1-庚炔
🗣️ 情景例句
Hail to the conquering heroes,
向进取的英雄们致敬，
A good tale is none the worse for being twice told.
好故事百听不厌。
My French isn't very good but it is enough to get by.
我的法语不是太好，但应付一下也够了。