翻譯4.07

Atoms are incredibly small. In fact,more than 3 million hydrogen atoms could sit side by side on the period at the end of this sentence. If you could view them with a supermicroscope,you would find that each different type of atom contains a certain number of subatomic particles. There are three types of these atomic building blocks: positively charged protons,uncharged neutrons,and negatively charged electrons.

原子是令人難以置信的小。事實上，超過300萬的氫原子可以並排在這句話的句點裡面。如果您想看他們可以用電子顯微鏡 ，你會發現，每一個不同類型的原子含有一定數量的次原子粒子。有3種類型的這些原子組合：帶正電的質子，中子無電荷，與帶負電荷的電子。