Ehl
[医][=effective half-life(of radioactive substances)]（放射性物质的）有效半衰期
🗣️ 情景例句
I'll make new friends wherever we are as long as we're together.
只要我们能在一起， 无论在哪儿我都能交到新朋友。
What is that noise?
那嘈杂声是什么？
A game that is very popular with these young swimmers is the underwater tricycle race.
这些幼小的游泳运动员非常喜爱的一种游戏是水下三轮车比赛。