了如指掌

tā duì wǒ liǎo rú zhǐ zhǎng

她对我了如指掌。

She could read me like a book.

tā duì dāng dì qíng kuàng liǎo rú zhǐ zhǎng

她对当地情况了如指掌。

She knows the place very well.

zhè běn jiào cái de nèi róng tā liǎo rú zhǐ zhǎng

这本教材的内容，他了如指掌。

He is very familiar with what is in this textbook.

duì dí qíng liǎo rú zhǐ zhǎng

对敌情了如指掌

understand the situation in the enemy camp like the back of one's hand

tā duì suǒ yǒu de zuì xīn fā zhǎn qíng kuàng dōu liǎo rú zhǐ zhǎng

她对所有的最新发展情况都了如指掌。

She's well up in all the latest developments.

nǐ děi duì gōng sī de chéng xù liǎo rú zhǐ zhǎng

你得对公司的程序了如指掌。

You need to become fully conversant with the company's procedures.