湖水清澈见底，非常适合游泳。

The lake's water is ___crystal ___clear, perfect for swimming.

你会被浅海清澈的水所惊叹。

You will be amazed by the ___crystal ___clear water of the shallow sea.

她的解释非常清晰，不容置疑。

Her explanation was ___crystal ___clear, leaving no room for doubt.