Considered individually, these atoms are so small that they can be seen only with the aid of a powerful microscope, if at all.
个别来看，这些原子十分小，只有借助高倍的显微镜才能看见它们。
All matter is made of atoms, which are so small that they can not be seen even through the most powerful microscope.
所有物质都是由小得甚至用倍数最大的显微镜也看不到的原子组成的。
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