短語詞組短語sex -ratio of progenies 子代性比birth -sex-ratio 生育性別比newborn infant sex ratio 新生嬰兒性別比biased sex ratio 偏性比uneven sex ratio 不均衡性比率sex ratio of conceptions 妊娠期性別比sex ratio at birth 出生性別比;出生嬰兒性別比secondary sex ratio 第二性比;[遺]次級(jí)性比 返回 sex ratio