It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固定
恒星说成是标准
非加

系,这是
种已经

习惯。
考系It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固定
恒星说成是标准
非加

系,这是
种已经

习惯。
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