弟弟[di di]，是亲属之间的一个称谓，出自《尔雅·释亲》。指同辈而年纪比自己小的男子。

弟弟用英文怎么写？

Younger brother

英 ['jʌŋɡə(r) ˈbrʌðə(r)]  美 ['jʌŋɡər ˈbrʌðər]

双语例句

1.I went to visit my friend's younger brother, a family of4. 

我到朋友的小弟家传福音，一家4个人。

2.My younger brother just got married so I should help him out. 

“小弟才刚刚结婚，我得帮帮他。”大哥暗想。

3.We had wanted to surprise my father with this present, but my younger brother let the cat out of the bag. 

我们本来想以这个礼物使父亲惊讶，但小弟却不小心泄漏了秘密。

4.During the night, the younger brother also begun to pour his rice into his older brother's barrel. 

当夜幕降临，小弟也开始将自己的大米倒入大哥的米缸。

5.Younger brother! Now that the harvest is over, let's divide the rice equally between us. 

小弟，现在地里的东西都收完了，我们俩平分这些大米吧！