Ehl
[医][=effective half-life(of radioactive substances)]（放射性物质的）有效半衰期
🗣️ 情景例句
I know it hurts.
我知道那儿痛。
Hasty love is soon hot and soon cold.
草草率率谈恋爱，热得快也冷得快。
Two main techniques have been used for training elephants,
驯象有两种主要的方法，