他使用很多非正式的表达方式。

He uses a lot of informal ___expressions.

'A can of worms' 是一个表示'困难局面'的表达方式。

"A can of worms" is an ___expression that means "a difficult situation."

通过这些视频，他们可以学习普通人日常使用的词语和表达方式。

Through these videos, they can learn everyday words and ___expressions used by ordinary people.