justify

/ˈʤəstəˌfaɪ/

show to be reasonable or provide adequate ground for

中文释义：证明…正当；为…辩护

How can the government justify spending billions on a project with little benefit?

政府如何证明在一个几乎没有效益的项目上花费数十亿是正当的？

The end does not always justify the means in ethical debates.

在伦理辩论中，目的并不总能证明手段的正当性。