Her younger brother is a doctor.
她弟弟是一名医生。
Her younger brother is a professional tennis player.
她弟弟是个职业网球运动员。
Her younger brother is simply a good-for-nothing, with a dilapidated reputation.
举例子她弟弟简直是个阿斗,名声很坏。
Her younger brother is a writer and her elder sister is a doctor.
她的弟弟是作家,而她姐姐是个医生。
Her younger brother is a writer, and her elder sister is a doctor.
她的弟弟是个作家,而她姐姐是个医生。