Pinyin/Theory Of Relativity
The theory of relativity was developed by Einstein in the early 1900s. There are two theories of relativity. The special relativity and the general relativity. Both are based on the principle of relativity, which was created by Galileo in the 1600s.
Xiāngduìlùn shì Einstein zài 20 shìjì-chū fāzhǎn de. Yǒu liǎngzhǒng xiāngduìlùn, xiáyì xiāngduìlùn hé guǎngyì xiāngduìlùn. Liǎngzhě dōu jīyú Galileo zài 17 shìjì chuàngjiàn de xiāngduìxìng yuánlǐ.