The first is the return status from a command, and the second is the trap command within your shell.
第一个是命令的返回状态，第二个是外壳中的trap命令。
Where does the exit status go after trap/return?
陷阱/后返回退出状态哪里去了？
Keep return piping valve closed until trap fills with condensate. Slowly open valve.
保持回路管道阀门处于关闭状态直到疏水阀充满冷凝物为止。慢慢开启阀门。
Keep return piping valve closed until trap fills with condensate. Slowly open valve.
保持回路管道阀门处于关闭状态直到疏水阀充满冷凝物为止。慢慢开启阀门。
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