Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
Hello, Mrs. Herrera. Hi, Carl, how you doing?
你好，Herrera太太，嗨，Carl，你怎么样啦？
By what time should I check in?
我该什么时间办理登机手续呢？
In this way, he was able to solve the mystery.
就这样，他解开了起火之谜。