be all at sea
Zhang erheng, a Chinese idiom, means that he can't figure out what's going on. From the legend of the plum in the Golden Vase.
The origin of Idioms
Chapter 6 of the legend of the plum in the Golden Vase: "when you see it, it's just like the second monk Zhang. You can't feel your head. You don't feel your leg joints soften and you flop down on your knees."
Idiom usage
Example: Zhou Tianhong was a little confused and asked, "why, no more positions?" Wei Wei's Fire Phoenix 107
be all at sea
copy sth. without catching its spirit - zhào māo huà hǔ
innate knowledge and sense of right and wrong - liáng zhī liáng néng
we had better stay over for a while - qiě zhù wéi jiā
Identify the source of drinking water - yǐn shuǐ biàn yuán