That's it for the functions - very simple.
这就是它的功能—非常简单。
Predicate functions are often very simple and better off being defined using a closure.
对函数使用断言通常很简单，而且最好使用闭包定义。
MongoDB's query engine also makes it very simple to apply aggregation and group functions on your data.
MongoDB的查询引擎也使得对数据应用聚合和分组函数变得非常简单。
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