这篇学术论文要求使用正式的语域，避免口语表达。

The academic paper required a formal ___register, avoiding colloquial expressions.

短信通常使用非正式的语域，带有缩写和表情符号。

Text messages often use an informal ___register with abbreviations and emojis.

一位熟练的公共演讲者能调整自己的语域以适应不同的听众。

A skilled public speaker can adapt their ___register to suit different audiences.