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Josept

Josept

Josept

Josept

1

Soon after 1770 , Josept Priestley discovered a gas which is now called " Laughing gas " Laughing gas became known in America.

在 1770 过后不久，约瑟夫。普里斯特利发现了一种气体现在被称作 “令人笑的气 ”。笑气被美国人知道了。

2

Soon after 1770 , Josept Priestley discovered a gas which is now

1770 年后不久，Josept 普里斯特利发现一种气体，它就是现在

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