其它方法使用中央认证中心来发放证书，这些证书保证了网络中从一点到另一点的安全通信。
Other approaches use a central certificate authority to issue certificates that guarantee secure communication from one point to another within a network.
从一点到另一点的路线的目标很真实，你有明确的要达到的目标，尤其是知道自己在回家的路上的时候。
A point to point course has real purpose, you have a destination to get to and someone special knows you are on the way home.
从一点到另一点的路线的目标很真实，你有明确的要达到的目标，尤其是知道自己在回家的路上的时候。
A point to point course has real purpose, you have a destination to get to and someone special knows you are on the way home.
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