前三行代码检查最新版本的 sqlalchemy，并将它作为包添加到您本地系统的 Python 安装中。
The first three lines of code check out the latest version of sqlalchemy and add it as a package to the Python installation on your local system.
管路上的各种阀门在安装前要拆开清洗，检查阀柄是否灵活，并经试压不漏后方可安装。
Take apart all valves along the pipeline for washing before installation, check whether valve handles are flexible. The valves can be installed after passing the pressure test.
上水管安装前，里边应检查和清扫一下。
Before installing the water supply pipe, you ought to inspect and clean it inside.
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