Hexafluoride
n. 六氟化物
??? 情景例句
There are a lot of beggars on the street, how can we help them?
街上的乞丐那么多，我們?cè)趺茨軒椭麄兡兀?/div>
To have a nice dream
做了個(gè)好夢(mèng)
Here it is.
給您。