In the morning one doesn't know what will happen in the evening.;be unable to plan out one's day;be preoccupied with the current crisis;live in constant fear for one's doom ;

A dying person who is sinking fast, like the sun setting beyond the western hills.
日薄西山,气息奄奄,人命危浅,朝不虑夕。(李密《陈情表》)
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