L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
Do you mind if I smoke?
我抽烟你介意吗？
Take care of small sums and the large will take care of themselves.
省小钱才能积大财。
Advertisers discovered years ago that all of us love to get something for nothing.
做广告的人们多年前就发现我们大家都喜欢免费得到东西。