Let us, for the sake of simplicity, call the mass determined in the first way the inertial mass and that determined in the second way the gravitational mass.
为简便起见，我们把用第一种方法所测定的质量叫做惯性质量，而把用第二种方法所测定的质量叫做引力质量。
Let us, for the sake of simplicity, call the mass determined in the first way the inertial mass and that determined in the second way the gravitational mass.
为简便起见，我们把用第一种方法所测定的质量叫做惯性质量，而把用第二种方法所测定的质量叫做引力质量。
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