皂白不分[zào bái bù fēn]
词典f
1. 多数人认为，唱不好歌，弹不好琴，如钢琴、小提琴或管乐，就别自不量力，皂白不分地硬将自己拙劣的表演加给公众，甚至熟人。 That they should not indiscriminately force their inferior performances upon the public, or even upon their acquaintances, I admit.