了如指掌的英文：
[Literal Meaning]
know/as/finger/palm
to know something very well

[解释]
对事物了解得非常清楚，像把东西放在手掌里给人家看一样。

[Explanation]
to know something very well

[例子]
他对这一带的地形了如指掌，所以没有费什么事就找到了泉水。

[Example]
He knew the terrain here very well and found the spring without much trouble.

[英文等价词]
to know something like the palm of one's hand
at one's fingertips

参考例句：
  • He knew every nook and cranny of the area.
    他对这一带的一草一木都了如指掌。
  • Esau was a farmer and hunter who knew every inch of the country.
    伊索是农人，也是猎户，对乡下各地都了如指掌。
  • The designer is hip to the latest fashion.
    设计师对时装的最新款式了如指掌。
  • No one can be sure about his future.
    没有谁能够对未来了如指掌。
  • Joseph knew the business cold.
    约瑟芬对此事了如指掌。
  • He knew all the surrounding fishing grounds like the palm of his hands.
    他对周围的渔场全都了如指掌。
  • The driver knew the ins and outs of the road.
    司机对这条路的一弯一拐，了如指掌。
  • He' s a taxi Driver, so he knows London like the back of his hand
    他是计程车司机,对伦敦市的街道了如指掌
  • Margaret knew the Franks' report inside out and upside down when she gave her statement on its findings
    当玛格丽特就调查结果发表意见时，她已经对弗兰克斯的报告了如指掌。
  • These pictures are familiar to all who take an interest in such things.
    所有热衷此道的人对这些画已了如指掌了。

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