Kuhlmannin
羟基二甲氧苯香豆素
🗣️ 情景例句
Work harder and practice more.
要更加努力地学习，更加勤奋地操练。
You cannot have two forenoons in the same day.
一日之中不可能有两个上午。
Pity we live so far from the sea.
真遗憾我们住得离海这么远。