Correct

透熟

/ tòu shú / 
Strokes

Example

As a Verb

know thoroughly; be familiar with; have sth at one's fingertips

1
Zhè
这
běn
本
shū
书
de
的
nèiróng
内容
  
,
tā
他
tòu
透
shú
熟
  
。

He is very familiar with what is in this book.

2
Duì
对
shùjù
数据
tòu
透
shú
熟

have the data at one's fingertips