如果有两个心跳，而非一，即通常是最好的说明一双胎妊娠。
If there are two heartbeats instead of one, that is usually the best indication of a twin pregnancy.
例如，假设两个私有网络通讯中的一个失效，VCS拥有剩下的网络通讯和磁盘心跳区域，允许心跳正常地继续下去。
For example, if one of two private network connections fails, VCS has the remaining network connection and the disk heartbeat region that allow heartbeats to continue normally.
有两个主要原因使心跳保持高于最小值。
There are two primary reasons for keeping the heartbeat above the minimum.
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