He has a young brother.
younger 是比较级, younger brother 才是弟弟
young 是指 年轻的意思。
看来年轻的意思如 looks young
brother 有大有小,这 brother 可以是哥哥 (elder or older brother), 或是 弟弟 (younger brother)
所以不能把年轻的弟弟翻译为 young younger brother !
他有一个年轻的弟弟
可以说: His younger brother looks young.
当然说成 She has a young younger brother 是怪怪的
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