因为惯性质量和引力质量的相等是阐明相对论的基本原理，我们应当在这里把它更细致地考查一番。
Since this identity of inertial and gravitational mass was fundamental for the formulation of the theory of relativity, we are justified in examining it a little more closely here.
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.
由于所得的总引力质量低于过去的光学测量结果，我们推测群成员NGC 1400之所以具有极大的本动速度，很可能是因为它在星系群的引力势作用下尚未达到最终的平衡状态。
Since the obtained total mass is lower than those given in the earlier galaxy kinematic works, we speculate that NGC 1400 is not a virialized member in the group's gravitational potential well.
由于所得的总引力质量低于过去的光学测量结果，我们推测群成员NGC 1400之所以具有极大的本动速度，很可能是因为它在星系群的引力势作用下尚未达到最终的平衡状态。
Since the obtained total mass is lower than those given in the earlier galaxy kinematic works, we speculate that NGC 1400 is not a virialized member in the group's gravitational potential well.
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