如果形容什么事情为crystal clear, 意思就是非常清楚，极其明白。

例句

He's given me crystal clear instructions on how to get to the wedding.

The boss was crystal clear about what she wanted the team to do whilst she was on holiday.

请注意

另一个短语 clear as mud, 表示很难理解或令人费解。

These instructions are as clear as mud – I'm never going to be able to get this mp3 player to work!