完全了解情况
to understand a situation completely
You know full well that you're not supposed to go there without asking me! 你非常清楚未经我同意你不能去那里！
He knew full well what was happening but he couldn't be bothered to do anything about it.
She knew full well that it was risky.
They knew full well that what they were doing was illegal.
They know full well that this policy will have disastrous consequences for poor people but they don't care.
See also: full adverb (COMPLETE)