我们所认为的“功绩”是教育的结果，并且更高一级的教育要求有更好的收入。
What we consider "merit" is the result of education, and greater education requires greater income.
这组对象可接着作为中间结果用于处理更高一级的表达式。
This set of objects might then serve as an intermediate result used in the processing of a higher-level expression.
这一级别可用于如下情况，在计费系统中，消息重复或丢失会导致不正确的结果。
This level could be used, for example, with billing systems where duplicate or lost messages could lead to incorrect charges being applied.
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