As these luminous and massive stars exhaust their hydrogen fuel, they begin to depart from the upper end of the main sequence.
当这些亮而且质量大的恒星耗尽了氢燃料时，它们就开始从主星序上端脱离。
A heavy star at the upper end of the main sequence has a rather different later history.
在主序上端的大恒星具有很不相同的晚年史。
A heavy star at the upper end of the main sequence has a rather different later history.
在主序上端的大恒星具有很不相同的晚年史。
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