... to teach one's grandma to suck eggs 不自量力 to know the ropes熟门熟路 by fits and starts 一曝十寒 ...
2
?懂得秘诀
to know the ropes懂得秘诀；内行 plain sailing 一帆风顺 ..
3
?内行
to know the ropes 懂得秘诀；内行 plain sailing 一帆风顺 ..
4
?懂局
地下铁路 tube; metro; underground; subway 懂局 to know the business; to know the ropes; au fait; to know one's onions; in the know; professional 对工作的测试 work test ..
双语例句
1
The moment she got toknowtheropes, there was no stopping her.
一旦她懂了行，她就一往无前了。
《柯林斯英汉双解大词典》
2
I've been to London before so I knowtheropes.
我去过伦敦，所以我了解伦敦的状况。
3
To be a good sailor, one must know how to tie and use theropes and sails.