It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固定的恒星说成的非加速参照系,这种已经确立的习惯。
It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固定的恒星说成的非加速参照系,这种已经确立的习惯。
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