Pertechnetate
高锝酸盐
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
Hedges have eyes, and walls have ears.
篱笆有眼，隔墙有耳。
You're just in time for the football match.
你正好赶上足球比赛。