Fd50
[医] 半数致死量
🗣️ 情景例句
I wish I had her energy.
我希望我有她那样的精力。
It matters not how long we live but how.
问题不是活得多么长，而是活得怎么样。
He is crazy about Crazy English.
他对疯狂英语很着迷。