Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
What are you working on?
你在做什么？
Sorry, sir. But it's our graduation day.
对不起，不过，今天是毕业的日子嘛。
We're out of a lot of the items.
有好几项都缺货了。