Tetrahydroxide
四羟化物
🗣️ 情景例句
Take care, and don't be a stranger.
保重，以后别见外。
Don't bury your head in the sand.
不要逃避现实。
I've looked round the whole school. I can't find it anywhere.
“我整个学校都找过了。我就是找不到它。”