第二个过滤器负责移除任何表达式左侧为一个基本类型或null型的列表条目。
The second filter removes any list items where the left side of the expression is a primitive type or a null.
第一类型比第二类型更基本，因为事件是由事物或事物的活动组成的。
The first type is more basic than the second because events are made up of things or of the actions of things.
第二章、外向型企业管理金融风险的基本策略。
Second chapter, the basic strategy of multinational corporation 's financial risk management.
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