Our forces need support to eliminate IS sleeper cells living among civilians.

我们的部队需要支持才能消灭生活在平民中的IS潜伏组织。

See, synthetic surfactants are really good at disrupting cell membranes: that thin layer that surrounds all living cells.

合成表面活性剂非常擅长破坏细胞膜：包围所有活细胞的薄层。

It can only make more of itself by entering a living cell.

它只能通过进入活细胞来发挥更多作用。

And seventy seven human viruses invade a living cell and turn it into a factory.

而77种人类病毒侵入一个活细胞并把它变成一个工厂。

Upon arriving in cold places, trees then evolved two techniques they still use to avoid frozen leaves: one is to fill living leaf cells with concentrated sugary sap, a biological version of anti-freeze.

到了寒冷的地方后，树木就进化出了两种它们至今仍在使用的技术来避免叶子被冻坏：一种是在活叶细胞中注入浓缩的糖汁，这是一种生物版的抗冻剂。

If you took a tropical tree (whether ancient or modern) and transported it to Siberia or Patagonia in winter, its water would freeze into sharp-edged ice crystals, fatally puncturing the living cells in all of its leaves.

如果你把一棵热带树（不管是古老的还是现代的）在冬天运到西伯利亚或巴塔哥尼亚，它的水会冻成锋利的冰晶，致命地刺破所有叶子中的活细胞。