It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固
星说成是标准非加速参照系，这是
种已经确立习惯。
It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固星说成是标准非加速参照系，这是种已经确立习惯。
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