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A lifetime, thirty thousand days, 30000=365=83 years, living to 83 years old means only 30000 days. After removing 10000 days of sleep, there are only 20000 days left. At 20 years old, there are only 15200 days left; at 30 years old, only 12700 days left; at 40 years old, only 10300 days left; at 50 years old, only 7900 days left; at 60 years old, only 5400 days left; at 70 years old, only 3000 days left; at 80 years old, only 500 days left. When the numbers are right in front of me, I suddenly feel that life is really so short! A hundred years from now, neither you nor I will be here. We strive for a lifetime but cannot take away a single blade of grass or a single tree. We cling to vanity and admiration for a lifetime, but we cannot take away a single bit of vanity. Life is so short; we have no time to argue, no time to be sad, and no time to be calculating. We only have time to love and to enjoy!