Fd50
[医] 半数致死量
🗣️ 情景例句
If you don't mind my asking, where did you come from?
你从哪儿来？要是你不介意我这么问的话。
No matter what the excuse, you must not be late.
不管有什么借口，你一定不要迟到。
chasms wider than the Grand Canyon and at least one mountain more than twice as tall as Everest.
比大峡谷还宽的裂缝，起码有一座山有珠穆朗玛峰的近两倍高。