L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
Um ... where's Mom?
唔……妈妈呢？
First of all, I will outline the characteristics of our product.
首先我将简略说明我们商品的特性。
With great difficulty, he climbed into the shop window to get the dress.
费了好大劲儿，他爬进橱窗去取那件衣服。