把这些高级思维过程与我们硬连线的风险探测系统结合起来，你就会得到一个几乎普遍的人类现象：担忧。
Combine these higher thought processes with our hardwired danger-detection systems, and you get a near-universal human phenomenon: worry.
两个系统的串口之间的直连线缆用来在两个节点间传输heartbeat。
A null modem cable connected between the serial ports of the two systems is used to transmit heartbeats between the two nodes.
主机：(1)多电脑系统中的主要中央处理机。(2)连线数据库的控制部。
Host: (1) Main central processing unit in a multi-computer system. (2) holder of an online database.
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