When @action is not set in the update element, it defaults to replace
当update元素中没有设置 @action 时，就默认执行替换操作
Where the defaults are set can reflect a tool's bias.
当然工具的默认设置也反映了某种偏见。
Create a new server entry, and set the defaults for Tomcat (see Figure 5).
建立一个新的服务器表项，并设置为Tomcat的默认值(见图5)。
Keep the Destination folder and File name set at their defaults.
将Destinationfolder和Filename设置为其默认值。
Keep the Destination folder and File name set at their defaults.
将Destinationfolder和Filename设置为其默认值。
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