于謙 千錘萬鑿出深山， 烈火焚燒作等閒。After myriad strikes and cuts, I came out of the hills deep; Treated to high heat and scorching flames, I would not weep.

粉身碎骨全不怕， 要留清白在人間 。 Breaking my bones into powder, I am not afraid; I would leave in this world my Chastity, like this made.

【石灰吟】  明  • 于謙
 
千錘萬擊(鑿)出深山，
烈火焚燒作等閒。
粉身碎骨全(渾)不怕，
要留清白在人間。

 
SHI HUI YIN ("The Limestone Song")
-- by YU QIAN (1398-1457)
-- Translated by Frank C Yue
 
After myriad strikes and cuts, I came out of the hills deep;
Treated to high heat and scorching flames, I would not weep.
Breaking my bones into powder, I am not afraid;
I would leave in this world my Chastity, like this made. 


the chemical changes described are reproduced below from the "baidu" net:

<诗中涉及到的化学变化:

"千锤万凿出深山" --- 物理变化，这时候还是石灰石。


"烈火焚烧若等闲" --- CaCO3（石灰石） 高温→CaO + CO2↑
　　
"粉身碎骨浑不怕" --- CaO （生石灰）+ H2O →Ca(OH)2

"要留清白在人间" --- Ca(OH)2（熟石灰） + CO2→ CaCO3↓ + H2O>


and...

<明史 · 于谦传
　　于谦为官廉洁正直，曾平反冤狱，救灾赈荒，深受百姓爱戴。明英宗时，瓦剌入侵，英宗被俘。于谦议立景帝，亲自率兵固守北京，击退瓦剌，使人民免遭蒙古 贵族再次野蛮统治。但英宗复辟后却以“谋逆罪”诬杀了这位民族英雄。这首《石灰吟》可以说是于谦生平和人格的真实写照。>