Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
A credit card is very useful when you go traveling.
当然旅游的时候，信用卡很有用。
We should be able to resolve our differences.
我们应该能解决我们的分歧。
not as description or reminiscence.
不要靠描述和印象去感觉。