Prodan
氟硅酸鈉
??? 情景例句
Are we ever going to finish?
我們這樣談得完嗎？
It is easy to prophesy after the event.
事后諸葛亮，預言頂便當。
1 'It's impossible---- don't waste my time.'
一、"根本不可能，不要浪費我的時間。"