They crossed through the great desert.

他们横穿过大沙漠。

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The second time, the participants were listening to music through headphones, and the final time, they crossed the street while talking on a cell phone with a researcher.

第二次，他们戴着耳机，听着音乐，第三次，他们和研究人员用手机交谈着过马路。

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At times they will seem to be insurmountable walls that can not possibly be crossed, and certainly not gone through.

很多时候它们会好象是不可逾越的许多墙壁，不太可能横渡，并且肯定没办法通过。

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Unless you are one of the first Americans, a Native American, we are all descended from folks who came from someplace else -- whether they arrived on the Mayflower or on a slave ship, whether they came through Ellis Island or crossed the Rio Grande.

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