Nanoparticles
纳米粒
🗣️ 情景例句
Are the people friendly in China?
中国的人们友好吗？
He's a policeman.
他是警察。
He informed the station at once, but no one there was able to explain the mystery.
他马上把情况报告了该基地，但那里的人没有一个能解释这到底是怎么回事。