forthesakeof、becauseof有什么区别

because of 因为、由于、基于;例句：It is mainly because of my fault.这主要是由于我的过错。for the sake of 为了;例句：Let's assume for the sake of argument that we manage to build a satisfactory database为了便于讨论，不妨假定我们成功地建立了一个令人满意的数据库。