Tetragraph
在密码中一连串的四个字母
🗣️ 情景例句
Come in, please.
请进。
I was not aware of the danger.
我没有意识到危险。
A lot of people object to mobile phones, especially when they are used in public places like restaurants or on public transport.
许多人都反对移动式电话，特别是在如饭店，公共交通车等公共场所使用移动电话。