open mind
noun uk/ˌəʊ.pən ˈmaɪnd/ us/ˌoʊ.pən ˈmaɪnd/
have/keep an open mindB2 不持任何偏见的;不存先入之见的
to wait until you know all the facts before forming an opinion or making a judgment
We should keep an open mind until all of the evidence is available. 在得到所有的证据之前我们应该不持任何偏见。