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.
我刚添加的新内容可能需要使用注释说明保护条件的用途，但是我现在不管这一点。
The new stuff I just added probably needs a comment explaining what the little guard condition does, but I'll leave that alone for now.
各种保护条件固然可能改变，但推测其变动不大，不可能损害此类债券的基本优良地位。
While the various protective elements are likely to change, such changes as can be visualized are most unlikely to impair the fundamentally strong position of such issues.
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