zhàng èr jīn gāng mō bu zháo tóu nǎo
see 丈二和尚,摸不著頭腦|丈二和尚,摸不着头脑[zhang4 er4 he2 shang5 , mo1 bu5 zhao2 tou2 nao3]
丈
zhàng
measure of length, ten Chinese feet (3.3 m)
二
èr
two
金
jīn
gold
刚
gāng
hard
摸
mō
to feel with the hand
不
bu
no; not so
着
zháo
to touch
头
tóu
head
脑
nǎo
brain