自然灾害是可怕的，也是无法预计的。
某次使用的值可能会残留下来，并以无法预计的方式干扰后续的代码。
Values from one use can linger on and interfere with later code in unexpected ways.
经济与社会因为英特网的连通性发生巨大变化。但是因它所传入的攻击力量也是无法预计的。
The connectivity of the Internet has done wonders for the economy and society, but it also has introduced a level of vulnerability that the director describes as unprecedented.
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