填充的单元格：左侧的元素用更特殊的元素代替。
A full cell: the element to the left is replaced by a more specific one.
这些保护条件用方括号括起，放在消息名的左侧，如图 3 所示。
These guard conditions are enclosed in square brackets to the left of the message name, as seen in Figure 3.
用这个设备能实现的唯一连接就是在OPB上的从连接；请在最左侧的空总线框中单击，建立此连接(框内会出现一个小写的“s”)。
The only connection you can make with this device is a slave connection on the OPB; click in the leftmost white bus square to establish this connection (a lowercase 's' will appear in the box).
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