Ehl
[医][=effective half-life(of radioactive substances)]（放射性物质的）有效半衰期
🗣️ 情景例句
on the telephone for me, please.
请替我拨电话。
What's the round-trip fare?
来回票价多少？
The pie committee decided that the best way to transport the dish would be by canal,
馅饼委员会确认运输这只盘子的最佳方案是通过运河水运。