Ministry of Education《Dictionary of Chinese Idioms》

to know your enemy as you know yourself know both ourselves and our adversaries

to be battle-shy because of one's weakness to have too many fears to be overcautious to be full of misgivings

to have the knowledge which lacks details

ambiguous not clear

to be terrified to be in terror of phobia

with reckless daring by deliberate intention

to find each other congenial

to recognize the whole through the observation of the part

shameless unblushing

to learn new things by reviewing old things

to be bright and comprehensive

benighted ignorant

to forecast precisely