在这个示例中，在系统启动时提前执行所有挂载。
In this case, all mounting is done in advance at system startup. For instance, after boot.
相对于欧式期权，美式期权是可以提前执行的。
Unlike the European options, the American options can be exercised early.
具体表现就是提前执行一些工作，比如确定数据库访问路径。
It does this by performing some work ahead of time, such as determining the database access path.
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