What is said here includes the precipitation of scientific terms, the precipitation of song titles and the precipitation of college students' original publication.
definition
From the meaning of this word, it means that a substance sinks because its density is higher than that of the solvent or solution in which it is located, and it is insoluble in them.
In fact, most of the precipitates are insoluble (grams dissolved per 100g of water at 20℃ are less than 0.0 1g).
If you want an article, it is as follows:
Precipitation history
History is really heavy.
From the beginning, my heart was inexplicably dignified.
I like to find and combine those familiar words in the yellowing history; I like watching the rise and fall of the royal family in the history of black and white films, watching the ups and downs of predecessors, and being confused, heavy, sad and excited in the blackboard written by the history teacher.
I once searched for the gravel in Su Dongpo's Red Cliff Fu, and dreamed of Yue Fei countless times.
Yesterday, I sang "I am hungry for pork, and I laugh and drink Hun blood." What a lofty ideal! "Don't wait for leisure, it's sad for nothing." Since you have chosen to serve your country faithfully, even if you die, even if you risk your life, what's the harm! I've worked hard all my life, but it's a pity that Qin Gui ruined his life with one punch and one fold.
Now, he only mourns, "Look up, shout to the sky, be strong and fierce." How can we pity "waiting for the beginning, cleaning up the old mountains and rivers and facing the sky?" Of course it's useless.
His life, like a piece of dust and sand, slowly falls and is constantly compressed by history, and finally precipitates into a waste of "Man Jiang Hong", which sublimates Yue Fei's tragic soul.
Time and time again, I walked slowly with history, watching the sunset on the mountain, watching the mighty whip, climbing the secluded platform, and listening to a song by Chen Ziang ... History precipitated the dusty road ahead, the noise of war and smoke, and many unyielding souls ... and finally smoothed out the vicissitudes of history.
History is just a loose sand, it is time, which has precipitated history and become river sand, passed down from generation to generation, passed down, recorded and passed away. ...