white白色多用来形容纯洁，如果形容一件东西比白色更白，那就是说它很干净、很白。whiter than white字面意思比白色还要白，就是说这个人很清白，从来都没有做错事。

【例句】
He declared himself ‘whiter than white’ despite a fraud and mismanagement report which forced his resignation only 12 hours ago.
尽管12个小时前他刚刚因为一份报告揭露他欺诈、管理不当而被迫辞职，现在他却宣称自己“清清白白”。

The government must be seen to be whiter than white.
政府须让人觉得是清正廉洁的。