了如指掌用英语怎么说，谢谢

know it very well

know sth like the palm of one's hand/
know like a book/
have sth at one's fingertips

以上是"了如指掌"的英语表达

例句:
He had the whole design of the machine at his fingertips.他对这种机器的整个设计了如指掌

字典上是这样的~~
了如指掌 : [ liǎo rú zhǐ zhǎng ]

1. have things at one's fingertips

http://www.dict.cn/search/?q=%C1%CB%C8%E7%D6%B8%D5%C6+

了如指掌
know sth. like the palm of one's hand

Clearly

Anticipate if point Zhang

in the hand