Fd50
[医] 半数致死量
🗣️ 情景例句
You should take your health more seriously.
你对自己的健康得更当回事儿。
She likes to keep up with the latest fashion.
她喜欢赶时髦。
When you visit London, one of the first things you will see is Big Ben,
当你游览伦敦时，首先看到的东西之一就是“大本”钟，