团支书的英文：
secretary of Youth League branch

secretary是什么意思：
n. 秘书，干事，大臣，部长，助理

The position of secretary is void.
秘书的职位现在空缺。

I have got a secretarial qualification.
担任秘书的资格证明。

He was the then secretary of Defense.
他是当时的国防部长。

youth是什么意思：
n. 青春（时期）；初期；青年们

The Flight of Youth
青春飞逝

My youth and youthful strength fled long ago.
我的青春和青春的活力早已消失。

The youth has plenty of go in him.
这个年轻人干劲十足。

league是什么意思：
n. 联盟，同盟；盟约；联合会
v. 组成联盟，结盟

They are not in the same league.
他们的水平有高低。

Make a league with me.
和我订立盟约吧。

The League was led by Communists.
这一同盟是由共产党领导的。