Thorotrase
膠質(zhì)二氧化釷
??? 情景例句
To do what?
做什么呢？
I'm afraid you will be discouraged.
我怕你會(huì)灰心。
It is one of the ugliest faces I have ever seen.
這是我見(jiàn)過(guò)的最丑陋的頭像之一。