即从单纯的语法选择，转向特定语言情景中的语意选择。
That is to say it has changed from the test of pure grammar rules to the test of language meaning in a given language situation.
使用“达尔文选择”或“达尔文进化论”这样的短语意味着工作中必须有另一种进化形式，一种可以用另一个形容词来描述的过程。
Using phrases like "Darwinian selection" or "Darwinian evolution" implies there must be another kind of evolution at work, a process that can be described with another adjective.
在选择访问路径之前，DB 2优化器将sql语句转换成语意上一致的形式，例如使用谓词下推或谓词传递闭包。
Before access path selection, the DB2 optimizer transforms SQL statements into forms that are semantically identical, such as by using predicate pushdown or predicate transitive closure.
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