Ld
致死剂量
🗣️ 情景例句
Don't mention it.
没事儿。
Mr. Chairman, may I have the floor?
主席，我可以发言吗？
The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
手术持续了4个多小时，非常难做，因为皮肤上覆盖着一层硬硬的树脂。