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
标准的非加速参照系，这
已经确立的习惯。
It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .
把固定的恒星说成标准的非加速参照系，这已经确立的习惯。
明：以上例句、词性
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