Read Part 1 of this series, which lays the groundwork for an open source data-collection application upon which an accessible and easy-to-use data collection service is built.
阅读本系列的第1部分，它已经为构建开源的数据收集应用程序打好基础。我们将以这个应用程序为基础构建一个可访问、易使用的数据收集服务。
It is easy to understand the meaning of accesses to roads and drainage pipe. Drainage pipe often lays under two side of roads, so it is finished when roads is completed.
道路通、下水通最容易理解，通常下水管道就铺设在道路下面，所以只要道路通了，下水就通了。
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