They can directly attack live tissue, which the body must then strain to replace.
它们会直接攻击活组织，这样的话人体就必须再生以便替换受攻击的组织。
We live in daily fear of an enemy attack.
我们天天提心吊胆，生怕敌人进攻。
YOU are old. You live alone. You suffer a heart attack. You cannot raise the alarm. You die.
你年纪大了。一个人生活。患了心脏病。不能动手报警。
YOU are old. You live alone. You suffer a heart attack. You cannot raise the alarm. You die.
你年纪大了。一个人生活。患了心脏病。不能动手报警。
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