justify表示“证明…是正当的”，是一个在写作和口语中都常用到的词
例句 The end justifies the means.
The new features of iPhone Xs cannot justify its hefty price tag.
翻译：
His decision could be justified from the economic view,but could be not justified on morility.
场景：任何事都不是污染空气的理由
造句：
Nothing can justify polluting the air.
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