Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
Your real education doesn't start until you get out into the real world.
直到你踏入现实社会，你才真正开始学习。
Your appointment will be next Thursday at 10 o'clock.
你的约会时间将是下一星期四的10点钟。
Since then, they have been trying to find out how the fire began.
从那时起，他们一直试图找出起火的原因。