half sister
柯林斯词典
1. N-COUNT Someone's half sister is a girl or woman who has either the same mother or the same father as they have. 同母异父姐妹; 同父异母姐妹
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1. N-COUNT Someone's half sister is a girl or woman who has either the same mother or the same father as they have. 同母异父姐妹; 同父异母姐妹