联合 + Object
联合 means "to unite" or "to join together," and is used when describing the act of combining forces or forming an alliance. It can function as both a verb and an adjective in Chinese.
两家公司决定联合开发新产品。
liǎng jiā gōngsī juédìng liánhé kāifā xīn chǎnpǐn.
The two companies decided to jointly develop new products.
大家应该联合起来解决这个问题。
dàjiā yīnggāi liánhé qǐlái jiějué zhège wèntí.
Everyone should unite to solve this problem.
多个部门联合调查了这起事故。
duō gè bùmén liánhé diàochá le zhè qǐ shìgù.
Multiple departments jointly investigated this accident.