水乳交融 交融：融合在一起。象水和乳汁融合在一起。比喻感情很融洽或結(jié)合十分緊密。
彼：那，對(duì)方；此：這，我方。不分這個(gè)和那個(gè)。形容關(guān)系密切，交情深厚。
[all is common;be on very intimate terms;with no distinction between what is one's own and what is another's] 形容關(guān)系很密切
