Pervanadate
过钒酸盐
🗣️ 情景例句
You don't know up from down.
你黑白不分。
Waste of time is the most extravagant and costly of all expenses.
浪费时间是一切花费中最奢侈豪华的费用。
Is it in one of your pockets ?
那张纸在你的口袋里吗？