Bioxide
二氧化物
🗣️ 情景例句
Typing is easy once you get the hang of it.
一旦你掌握诀窍，打字就很简单。
Why are you standing behind the door?
你为什么站在门后？
Once in a while sailors came down, Kunta thought, to carry sick men upstairs for treatment.
偶尔水手下来，孔塔猜想是把生病的人抬上去进行治疗。