副局长 (fùjúzhǎng) is a noun meaning "deputy director" or "vice bureau chief." It refers to the second-in-command of a government bureau or department, ranking directly below the 局长 (director).
副局长今天出去考察了,不在办公室。
Fù júzhǎng jīntiān chūqù kǎochá le, bú zài bàngōngshì.
The deputy bureau director went out for an inspection today and is not in the office.
她担任副局长已经三年了。
Tā dānrèn fù júzhǎng yǐjīng sān nián le.
She has served as deputy bureau director for three years now.
这件事需要请副局长签字批准。
Zhè jiàn shì xūyào qǐng fù júzhǎng qiānzì pīzhǔn.
This matter requires the deputy bureau director's signature for approval.