已经有实验表明，称为T细胞的免疫细胞能够积极地穿越组织，直接接触肿瘤细胞从而杀死肿瘤细胞。
In recorded experiments, immune cells called t cells can be seen actively migrating though tissues, making direct contact with tumor cells, and killing them.
由于船要在极地地区航行，那么也需要动力装置以满足穿越冰海的需求。
As this boat will navigate the Polar Regions, it was necessary to have motors to travel through the sea ice.
科学家们认为这些迁居者通过一条史前时期曾经存在的大陆桥穿越北极地区的白令海峡到达美洲。
Scientists believe that these settlers crocced the Bering Strait in the Arctic to America by means of a land bridge which existed in prehistoric times.
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