This pattern requires that the value being published be effectively immutable — that its state not change after publication.
这个模式要求被发布的值是有效不可变的——即值的状态在发布后不会更改。
Pattern #2: one-time safe publication
模式 #2：一次性安全发布（one-time safe publication）
The front side includes the images of the emblem for the expo: the Lord pattern, and publication "2011 xian world horticultural exposition," the words.
正面图案：主图案为世园会会徽，并刊“2011西安世界园艺博览会”字样。
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