This area includes rock art made by people who lived there more than two thousand years ago.

VOA: special.2009.04.15

So because so much popular music and particularly rock music has those chords in root position we can track them more readily.

因为很多流行音乐尤其是摇滚乐会在原位上添加这样的和弦,这样听起来会比较悦耳。

耶鲁公开课 - 聆听音乐课程节选

But the fact is that I'm sure there are a few people - - thay may be more than a few in the facility - who do feel that rock and roll is not exactly what one says fit and proper.

不过事实上，我相信,在学校里确实有许多人-,认为摇滚和艺术,并不完全相称。

普林斯顿公开课 - 人性课程节选

The belayer then gives more rope up to the lead climber as he moves up the rock.

VOA: special.2009.12.09

They collected more than thirty kilograms of rock and soil to take back to Earth.

VOA: special.2009.07.15

Below,the flowing river continued to uncover more and more levels of ancient rock.

VOA: special.2009.10.07

That is more than in past rock climbing studies.

VOA: special.2009.12.09