crystal clear adjective
Learner's definition of CRYSTAL CLEAR
1
: perfectly clear : able to be seen through completely清澈的；明澈的，透明的 2
: perfectly easy to understand清晰的；浅显易懂的 -
“Was my request clear?” “Yes, crystal clear.”“我的要求清楚吗？”“是的，非常清楚。”
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Eventually it became crystal clear that something had to change.最终明确了，有的事情必须要改变。