有一条成语“泾渭分明”，
说的是两条河一浊一清，
就在那甘肃陕西两省境，
两条河汇合后清浊分明。
假如是生活中有两种事物，
两事物有特点各自不同，
便可将这条成语用，
把它们确切地加以形容。
如人们对事物有爱有恨，
又比如对某事反对或赞成，
切不可人云亦云缺乏主见，
有立场有主见才泾渭分明。
River Jing and River Wei
Are Sharply Different
In Chinese there is an idiom called“River Jing and River Wei Are Sharply Different”。It tells of two rivers-one is clear and the other is dusty yellow。The two rivers are respectively in Gansu and Shaanxi。It is interesting because it keeps half clear and half muddy after they merge。
When you meet two things in daily life which bear a distinct difference，you can use the ready-made idiom to definitely describe this case。
Another instance is when you hate one thing while you love another and when you are for something and against something else。
Try not to echo what others say and keep a dull-witted head hold an opinion and you will be able to tell the difference。
