The operators and libraries are just a matter of slowly accumulating knowledge and being willing to check reference materials until you memorize what you need to know.
操作符和库只不过是知识逐步积累的过程，你什么时候想清楚要了解什 么了，再去查阅参考材料也不迟。
Since tagging can be done freely by anybody, nothing prevents irrelevant tags or tagging errors from accumulating slowly in search collections over time.
因为任何人都可以随意地建立标记，所以经过一段时间后，在搜索集合中无法防止无关标记或错误标记的出现。
Whereas entity beans rose quickly to prominence and then fell just as quickly out of favor, the popular acceptance of session beans and JDBC has been accumulating slowly and steadily over time.
在实体bean很快脱颖而出又很快失宠的时候，对会话bean和JDBC的接受程度却随着时间的推移缓慢而稳定地积累起来。
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