气候变暖是全球性的，但是从气候变化模型上看却将在北半球扩散——永久冻土融化，人类定居点被迫转移。
The planet's warming may be global, but climate-change models predict it will be amplified in the north. Permafrost will melt and settlement patterns will change.
转移性肿瘤细胞—那些已从原发部位扩散开的细胞—比别的细胞移动得要快。
Metastatic tumour cells-those which have spread from the site of the original tumour-migrate faster than other cells.
细胞就能更快速地改变成一个更具侵袭性的形状而穿透周围组织，这是肿瘤更易扩散和可能形成转移的关键一步。
The cell can change more rapidly to a more aggressive form and penetrate surrounding tissue, a crucial step toward increased spreading of the tumor and the possible formation of metastases.
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