This is the 7322nd most frequent Chinese word.
胞弟
Younger brother (biological).
In this sentence, '胞弟' means 'younger brother', which is used to specify a familial relationship where the younger brother is related by blood.
我的胞弟正在上大学。
My younger brother is currently attending college.
Here, '胞弟' specifies the recipient of the gift, emphasizing the close family relationship.
这个礼物是我送给我胞弟的。
This gift is from me to my younger brother.
In this statement, '胞弟' is used to denote a companion who is the speaker's younger brother in the shared activity.