Ehl
[医][=effective half-life(of radioactive substances)]（放射性物质的）有效半衰期
🗣️ 情景例句
How long do you plan to stay with this company, if hired?
如果被雇佣，你打算在这家公司呆多久？
Practice is better than precept.
身教胜于言教。
Walking up and down the stairs would beat any exercise machine.
上下楼梯可比什么健身器都要好。