这个选择器和之前说的基础过滤(Basic Filters)中的 eq() 有些类似 ,不同的地方就是前者(:nth-child)是从1开始,后者(:eq)是从0开始.
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basic vector directional filters 基本矢量方向滤波器
Thus far, we discussed how to write your JDBC Data Mediator Service code to perform some basic select queries and more advanced queries involving filters and multiple tables against a database.
到现在为止，我们讨论了如何编写 JDBC 数据中介服务代码来执行一些基本选择查询和更高级的查询（涉及过滤器和数据库中的多个表）。
Some basic networking concepts were presented, as well as a summary of required packages and commands to operate with filters.
同时还讲解了一些基本的网络概念，并总结了执行过滤所要用到的包和命令。
You had three choices: simulate transparency using flat images, deal with PNG's cross-browser incompatibilities, or struggle with CSS 'basic transparency selectors and filters.
你有三种选择：使用平面图像模拟的透明度，使用不能跨浏览器兼容的PNG格式，或者去折腾CSS基本的透明选择器和滤镜。
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