Once man begins to see the depth of the depravity he has been living in, he will, in larger Numbers, begin to make changes.

一旦人类开始看清他们一直生活得多么堕落，他们将大规模地发生变化。

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Mr Obama later visited the Yad Vashem Holocaust memorial, which he said illustrated the depravity to which man could sink but also served as a reminder of the "righteous among nations who refused to be bystanders".

BBC: Obama tours symbolic sites in Israel and West Bank