We all know the theory that matter is made up of atoms and molecules.
我们大家都知道这一理论，即：物质是由原子和分子构成的。
We all know the theory that matter is made up of atoms and molecules.
我们都知道物质由原子和分子构成这一理论。
As we know, all matter consists of molecules, and molecules (consists) of atoms.
众所周知，一切物质由分子组成，而分子由原子组成。
As we know, all matter consists of molecules, and molecules (consists) of atoms.
众所周知，一切物质由分子组成，而分子由原子组成。
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