keep an eye open 密切注视
keep one's weather eye open 注意观察天气变化情况
Keep eye wide open 保持眼睛睁开
keep an eye open for 严密注视
This patient, who could barely keep her eyelids open, was diagnosed by her eye doctor.
图上眼科医生诊断的这位病人，几乎不能把眼皮睁开。
They will ask health-care staffs to keep an eye out for patients and colleagues who seem open to extremism.
他们将会要求医护人员继续观察有极端倾向的病人和身边的同事。
When you gaze up at the stars at night, you are looking into the unblinking eyes of elephants, who sleep with one eye open, to best keep watch over us.
当你凝视夜空星斗，你都能看到不闭眼的象群，酣眠时睁开一只眼睛，好好的照看我们。
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