After the trap has been set, define two variables to ease the typing later in the script.
在设置了陷阱之后，定义两个变量以便稍后在脚本中键入时使用。
Union fittings and shutoff valves should be installed on both sides of trap for ease of servicing and trap testing.
在疏水阀两侧应该安装连接装置和关断阀，以简化维修和疏水阀测试。
Union fittings and shutoff valves should be installed on both sides of trap for ease of servicing and trap testing.
在疏水阀两侧应该安装连接装置和关断阀，以简化维修和疏水阀测试。
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