An atom contains a tiny heavy nucleus.
一个原子含有一个微小而重的核。
One proton is almost as heavy as an entire atom of hydrogen.
一个质子几乎与整个氢原子的重量相等。
The oxygen atom is nearly 16 times as heavy as the hydrogen atom.
氧原子的重量几乎是氢原子的16倍。
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