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.
悬吊绳、拉力绳、安全绳、固定绳应该每周或每次使用前检查一次，规格(额定工作负荷)、磨损限度、损坏程度或安装。
Suspension lines, pull lines, backup lines and snub lines should be inspected weekly and before every job for specifications (job load ratings), wear limits, damage, or improper installation.
在安装前还须要检查些什么？
敷板前驾驶室检查主干电缆安装。
Inspection main cable installation for wheel house before paneling decoration.
介绍了TIG焊机的构成、分类、安装前的检查、准备和安装后的检查与调试；阐述了TIG焊的特点，以及应该如何合理选择。
It introduces the TIG welding machine's structure, classification, check before installation and debug after installation, expounds the characteristics of TIG welding and how to choose reasonably.
包括：1、安装前的准备；2、设备的开箱检查和验收，各设备基础的检查和校正；3、各主要设备和辅助设备的就位；4、锅炉烟道系统的制作及安装。
Including: 1, Before installation: 2 the open-package inspection and acceptance of the equipment, the inspection and calibration equipment foundation, 3 the main equipment and auxiliary equipment 4.
生成自动将自身安装在客户系统上的应用程序时，请检查数据库是否已经存在，并且在创建新的数据库前将其删除。
When building an application that automatically installs itself on a customer system, see if the database already exists and drop it before creating a new one.
安装前请检查内腔有无杂物附着，否则会堵塞u型阀芯或损坏阀件。
Check the valve if there is lumber inside the body, which will block the valve cartridge or damage the parts.
安装前请检查内腔有无杂物附着，否则会堵塞u型阀芯或损坏阀件。
Check the valve if there is lumber inside the body, which will block the valve cartridge or damage the parts.
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