know what's what
US /noʊ wʌts wʌt/
UK /nəʊ wɒts wɒt/
成语
知道是怎么回事, 了解情况
to have a good understanding of a situation or of how things work
示例:
•
She's been in this business for years, so she really knows what's what.
她在这个行业多年，所以她真的知道是怎么回事。
•
You need to spend some time learning the ropes if you want to know what's what around here.
如果你想在这里知道是怎么回事，你需要花一些时间学习窍门。