弟弟的英语是 "little brother" 或 "younger brother"，如果您需要更多的信息，可以参考以下链接：
- How to say little brother in English?
- What is the difference between a younger brother and an older brother?
- How do you address your little brother in text message?
弟弟的英语是 "little brother" 或 "younger brother"，如果您需要更多的信息，可以参考以下链接：
- How to say little brother in English?
- What is the difference between a younger brother and an older brother?
- How do you address your little brother in text message?
