Racs
[医][=relative absorption cross section]相对吸收截面，相对吸收断面
🗣️ 情景例句
I really appreciate you coming over to help me with my math.
我真的很感谢你过来帮我补习数学。
If you want to be healthy, you have to stop smoking cigarettes.
如果你要身体健康的话，必须停止抽香烟。
It was Sunday.I never get up early on Sundays.
那是个星期天，而在星期天我是从来不早起的，