1, how time flies when you get old. Although Bian Hua never changed his original intention, he still tried to listen to old songs in a golden coat, still like being drunk in the past. -Ouyang Xiu's "Picking Mulberry Seeds"
2. Where were those lost times before me? Behind me, where are the future generations? I thought of heaven and earth, with no limit and no end. I was alone and my tears fell. -Chen Ziang is on the Youzhou Tower.
3, thirty fame dust, eight thousand miles of clouds and months. Don't be idle, it's white and sad. -Song Yuefei's "Man Jiang Hong"
4. Yesterday, yesterday, yesterday was great! Yesterday passed, but today I'm bored. The world regrets yesterday, but does not feel that today has passed again. Water flows every day, and the setting sun is rare. The Ming Dynasty will regret what it achieved today. -Wen Jia's Song of Yesterday
5, flowers will reopen one day, and people will no longer be young. -Yuan's "Dou E Yuan" and "Dou E Yuan"
In retrospect, it was sweet to go to the last year. The night is dim, and I have no sleep to read and listen to the spring talk. Every day is a new one, and I am no longer at leisure, watching the moonlight-filled stars go all the way.
We must remember that our study time is limited. Time is limited, not only because life is short, but also because of the complexity of people. We should try to spend all our time doing the most beneficial things.
8. Where were those lost times before me? Behind me, where are the future generations? I thought of heaven and earth, with no limit and no end. I was alone and my tears fell. -Don Chen Ziang is on the Youzhou Tower.
9. It is difficult to get up in the morning when the prime of life is no longer coming. -Tao Jin's "Yuan Ming Zashi"
10, flowers will reopen one day, and people will no longer be young. -Dou Eyuan's Dou Eyuan
Time is one of the seven basic physical quantities in physics (length m, time s, mass kg, thermodynamic temperature k (K), current unit a (A), light intensity cd (Candeira), and quantity of matter mol (mol)), and its symbol is T.
In the International System of Units (SI), the basic unit of time is seconds, and the symbol is S, 13, which was held in 1967. The definition of seconds is: 9,192,63 of radiation corresponding to two hyperfine energy level transitions of cesium-133. The cesium atom mentioned in this definition must be at rest at absolute zero, and the environment on the ground is zero magnetic field.
The second defined in this case is equivalent to the second defined in the astronomical almanac. Common time units in life are: millisecond ms, minute min, hour h, day) d, month m, year y, etc.