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。
Both search engines swapped PR blows over who was bigger, then we got detente when the count went away.
两家搜索引擎变着法子争论自己更大，计数消失后我们才感觉缓和一些。
Wilhelmsen swapped Numbers for wool yarns to visualize time in a new physical form that changes and develops as days pass - the clock will knit a 2 meter long scarf over the course of a year.
Wilhelmsen用毛线替代了数字从而实现了用一种新的实实在在的实物形态来将无形的时间可视化，这种实物形态随着日子一天天过去而发生变化——它一年能织出一条2米长的围巾。
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