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过去100年来，天文学家特别注意一类称作“仙王座变光星”的恒星。
For 100 years astronomers have paid particular attention to a class of variable star known as the Cepheids.
youdao
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过去100年来，天文学家特别注意一类称作“仙王座变光星”的恒星。
For 100 years astronomers have paid particular attention to a class of variable star known as the Cepheids.
youdao