同命运共呼吸　

◎ 同命运共呼吸 tóng mìngyùn gòng hūxī

[share weal and woe;share the same fate and breathe the same air;identify oneself heart and soul with] 形容双方关系密切,利害一致

我们都是同命运共呼吸的人,难道还不能互相信任