It means to be bitter that life is too short.
Pronunciation: rén shēng kǔ duǎn
Analysis: bitter is not an adjective here, and like going to the day of bitterness, it doesn't mean that there were many bitter days in the past time, but rather, it means bitter that life is too short. It's not that life is too short, but that we don't treasure our time. Sometimes it also means "life is bitter and short", but here bitter is an adjective.
Source: European Renaissance dramatist Shakespeare's "The Tempest": life is too short to be wasted.
Example: Life is too short to live, so let your heart relax and look down on things; to live is to win.
Expanded Information
Buddhist views on the shortness of life
1. Among Buddhists, the view is that the nature of the world is suffering because everything in the world is impermanent and ever-changing, and that gain inevitably leads to suffering as a result of loss.
2, the world of law is relative, there is life and death, there is a gathering that is scattered. Su Shi had left words to do the unprecedented melancholy: "people have sadness and happiness, the moon has a roundness". Today's wedding night with the passage of time, will be replaced by the parting of life and death.
3. Therefore, we have to look down on this chaotic material world, we should strive to pursue the inner nature of the original.