名词
中文翻译：Unknown
同义词：
['electric mass', 'electromagnetic mass']
例句：
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1. The electron's mass is a fundamental property of the atom.
电子的质量是原子的基本属性。
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2. The mass of the planet is determined by its composition and gravity.
行星的质量由其组成和重力决定。
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3. The mass of the object can be calculated using the formula M = m/r^2,where M is the mass and m is the mass of the object.
物体的质量可以通过公式M = m/r^2来计算，其中M是物体的质量，m是物体的质量。