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Meaning of 了如指掌

Lookup via: Pinyin | Radicals
了 liǎo 如 rú 指 zhǐ 掌 zhǎng
to know sth like the back of one's hand (idiom); to know (a person, a place etc) inside out
Example Sentences
1
我们真的对自己了如指掌吗
?
But do we know really know ourselves?
2
他对这一带的地形了如指掌
。
He knows the terrain of this locality like the back of his hand.
3
你对你的行业里的任何事情都了如指掌吗
?
Can you know everything going on in your field or industry?
4
无处不在的设备
:
你的手机对你周围的世界了如指掌
。
Sensors everywhere: Your phone knows a lot about the world around you.
5
但是不要表现出你对这个公司的一切都了如指掌
。
But don't act as if you know everything about the place.