虽然这不是SSL标准的一部分，但是这个步骤却是高度建议的，它可以防止中间人攻击。
This is not part of the SSL standard, but is highly recommended to prevent a man in the middle attack (MITM).
实现服务时，必须使其能够承受服务的抵赖攻击，从而保持高度可用。
The service must be implemented such that it can withstand denial of service attacks and hence remain highly available.
所有生物组织中的DNA都处于被高度活跃的化学物质和辐射的不停攻击之下，而且DNA复制过程中经常出错。
The DNA in all organisms is under constant attack from highly reactive chemicals and radiation, and errors are often made when it is copied.
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