Difluoride
二氟化物
🗣️ 情景例句
Hello, Mr. Maxwell.
哈喽， Maxwell先生。
When are you off?
你什么时候动身？
However, a new type of humour, which stems largely from the U.S.,has recently come into fashion.
然而，近来一种新式幽默流行了起来，这种幽默主要来自美国。