L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
He strikes the table angrily.
他气得大拍桌子。
Competition for this kind of goods is tough.
这种商品的竞争非常激烈。
Jim is writing. Lily isn't writing. She's looking at the blackboard.
吉姆在写字。莉莉没在写字。她在看黑板。