To justify a decision, action, or idea means to show or prove that it is reasonable or necessary 證明…有理，正當(dāng) 為…辯護(hù)
The end justifies the means.
The new features of iphone Xs cannot justify its hefty price tag.
他的決定從經(jīng)濟(jì)上完全可以理解，但從道德上很難成立值漫。His decision can be justified from an economic point of view ，but can hardly be ethically justified.
他想為自己的缺席辯解 但是理由不行 He tried to justify his absence with lame excuses.
