Mars and Earth have swapped about a billion tons of rock over the years, Carr says, and experiments show that some hitch-hiking microbes can survive the journey.

在过去几年中，火星和地球已经交换了大约十亿吨的岩石，卡尔说，实验表明，许多被顺便带走的微生物可以在这个“长途旅行”的过程中生存下来。

youdao

Furthermore, the designs were covered with "desert varnish", a glaze that develops on rock surfaces over thousands of years of exposure to the elements.

此外，这些设计还覆盖有“沙漠清漆”，一种在岩石表面经过数千年在这些元素暴露下而形成的釉料。

youdao

As I said before, you can find rock art all over the world, but I'd like to focus now on the rock art of the Aboriginal people of Australia.

就像我之前说的，世界各地都有岩石艺术，但是我现在想要关注的是澳大利亚土著人的岩石艺术。

youdao

People come from all over the world to climb one of the huge rock formations at Yosemite.

VOA: special.2009.01.07

The rock formations there are the result of deposits made by ancient lakes and rivers over a period of about twenty million years.

VOA: special.2009.04.15

Mr. O'CONNOR: The ICP technology involves drilling holes--vertical holes into the ground and inserting long electric heaters, which then gradually heat the rock over a long period of time, and over a long period of time--by that, I mean two or three or more years.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale

The question on the table for the GOP Leadership is, why not pass the King Amendment in the House and use it as leverage, not to send the ObamaCare rock over the cliff but to lift it just high enough to slip in whatever is possible in negotiations with the Senate and the president?

FORBES: The GOP: Not The Gipper's Team Any Longer

The next day at Derby in Chicago, classic rock blasted over the hum of 27 televisions broadcasting hockey games.

WSJ: Gentlemen, Start Your Little Cars: These Derbies Are for Grown-Ups