L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
During our stay in London, we visited Buckingham Place.
我们在伦敦逗留期间参观了白金汉宫。
My first name is Bill.
我的名字叫比尔。
The survey revealed a large number of sources of noise that we really dislike.
这个调查显示出很大数目我们不喜欢的噪音源：