Definition
[vt] to justify a decision, action, or idea means to show or prove that it is reasonable or necessary.
Sentence
The end justifies the means.
The new features of iPhone Xs cannot justify its hefty price tag.
The increasingly high cost of a few extra square feet of housing, not to mention of providing a good education, also makes it economically harder to justify more children.
Practice
1. 他的决定从经济上完全可以理解，但从道德上很难成立。
His decision can be justified fully in economy, but hardly in morals.
His decision can be justified from an economic point of view but can hardly be morally/ethically justified.
2. 任何理由都不能为战争开脱。
No excuse can justify a war.
No argument can justify a war.
3. 部长们一致同意，这个决定完全符合经济情况。
The ministers all agreed that this decision was fully justified by the economy.
Ministers agreed that this decision was fully justified by economic conditions.
