He is my maternal uncle.是什么意思？

He is my maternal uncle.

他是我舅舅。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

my

adj. 我的(I的所有格形式)；int. 啊呀，天啊；

例句
Racial discrimination is abhorrent to my council and our staff...
我的顾问班子和全体工作人员都对种族歧视深恶痛绝。

maternal

adj. 母亲的，母亲般的，母系的，母亲方面的；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

uncle

n. 叔叔，伯父，舅父，姑父，姨父；

例句
His uncle is dead, but his auntie still lives here.
他伯父已经过世，可他伯母还在这儿生活。