了如指掌

• I am thoroughly conversant with all the rules
  我对所有的规则了如指掌。
• One has to be honest about one ' s own style of riding
  一个人要对自己的骑乘风格了如指掌。
• I thought you knew everything about that case
  我以为你对案件了如指掌呢
• Are the secrets of nature all mastered
  难道大自然的奥秘都已了如指掌？
• He knew the passage like the palm of his hand
  他对这条航线了如指掌。
• Oh , i know all about the cocks in your henhouse
  我对你的事了如指掌
• It ' s okay , jenna . i know all about your little deal
  很好，珍娜我现在对你们那套交易了如指掌
• She had the whole answer at her fingertips
  她对整个答案了如指掌。
• I know this city like the back of my hand
  我对这个城市了如指掌。
• Know something like the palm of one ' s hand
  熟知其事，了如指掌。