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我已经向你们展示了原子质量了。
I already showed you the atomic mass.
youdao
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我会在深入,还会预测它的原子质量是多少。
And I will go even further and will predict what its atomic mass is.
youdao
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这是原子质量。
And this is called the atomic mass.
youdao
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这是原子质量。
And this is called the atomic mass.
youdao