部长 (bùzhǎng) means minister or department head, referring to the leader of a government ministry or department. It is composed of 部 (department) and 长 (chief/head). For example, 移民部长 means "Minister of Immigration."
教育部长今天发表了重要讲话。
Jiàoyù bùzhǎng jīntiān fābiǎo le zhòngyào jiǎnghuà.
The Minister of Education delivered an important speech today.
新任移民部长上周正式就职了。
Xīnrèn yímín bùzhǎng shàng zhōu zhèngshì jiùzhí le.
The new immigration minister officially took office last week.
部长要求各部门提高工作效率。
Bùzhǎng yāoqiú gè bùmén tígāo gōngzuò xiàolǜ.
The minister asked all departments to improve work efficiency.