Dinaphthylamine
二萘胺
🗣️ 情景例句
before getting to the tough stuff--math.
在对付难缠的东西 数学 之前。
It matters not how long we live but how.
问题不是活得多么长，而是活得怎么样。
Hello! Could I speak to the headmaster, please?
您好！我能和校长通话吗？