The differences of the past will fade in time. It's just like during a battle when everyone goes to their stations. Someone takes care of the medical support, someone else carries the rifles-everyone cooperates hand in hand. But if you just sit around polishing your rife and chatting when there is no immediate crisis, well, then the problems come.
過去的事情就會淡化，就像戰鬥時大家各就各位，你負責醫療、我負責上槍，大家合作無間；但沒事時擦槍聊天，問題就來了。