密切合作

tā men zhèng hé dì fāng yì huì mì qiè hé zuò

他们正和地方议会密切合作。

They are working in close partnership with the local council.

zài èr zhàn shí yì dà lì yǔ dé guó mì qiè hé zuò

在二战时，意大利与德国密切合作。

Italy was closely aligned with Germany in World War II.