the act of believing that something is true without having any proof

The presumption of innocence is central to American law. 美国法律的核心是无罪假定。

There is no scientific evidence to support such presumptions. 并无科学依据支持这样的推测。

[ + that ] The decision is based on the presumption that all information must be freely available. 这个决定是建立在一切信息都必须免费提供这一假定之上的。