只看外表 meaning in English

look at the surface only

You only see the superficial instead of the essential . that s why you think these people are good
你们只看外表，没看到里面，才会认为那些人那么好。
Hence , with certain things , we do not know the truth without personal experience . we perceive only the outside appearances , which are not correct
所以，有一些事情我们自己如果没有亲身体会的话，就不会知道真相，我们只看外表，都不是正确的。