John Butterfield ordered his men never to let the mail out of their sight.

VOA: special.2010.04.26

We've used the fundamental equations that are hiding down here, out of sight but never out of mind.

我们利用了,写在这里的基本方程，虽然没有注意它但却时时刻刻记者它。

麻省理工公开课 - 热力学与动力学课程节选

It would go out of his sight, and then it would pass again going back down to the table.

会飘落到上面，时隐时现的，“

耶鲁公开课 - 1945年后的美国小说课程节选

They went flying down the path and out of sight.

VOA: special.2010.01.30

On the other hand, if out of sight out of mind, they should expect the screen to keep going.

另一方面,如果看不见就觉得不存在,那么婴儿会期待屏板继续移动

耶鲁公开课 - 心理学导论课程节选

about the health of Kim Jong Il. The North Korean leader remained out of sight for a number of significant occasions, including the launch of a long-range rocket that angered the international community.

VOA: standard.2009.12.30