main sequence
柯林斯词典
1. N a diagonal band on the Hertzsprung Russell diagram containing about 90% of all known stars; stars evolve onto and then off the band during their lifetime 主星序; 参见赫罗图简表上的斜线地带，含有百分之九十左右的已知行星，行星在其生命中演变至此地带，然后再离开
2. N (as modifier) 主星序的
a main-sequence star
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