Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
Hi, how are you doing?
你还好吗？
I think gray hair makes you look rather distinguished.
我觉得你灰白的头发使你看上去很严肃。
We'll be taking quotations next month.
我们将在下个月接受报价。