cā liàng yǎn jīng
to keep one's eyes open (idiom)
to be on one's guard; to be clear-eyed
擦
cā
to rub; to scratch
亮
liàng
bright; light
眼
yǎn
eye (CL:隻|只[zhi1],雙|双[shuang1])
睛
jīng
eye; eyeball
Review