Measure and record the differential pressure across the valve using a Watts Series PG meter. CAUTION: Safety glasses should be used.
采用美国瓦茨系列PG仪器测量和记录通过阀门的压差。警告：应该使用安全眼镜。
2
Read the pressure drop across the valve with a Watts Series PG meter.
利用美国瓦茨系列PG仪器读出通过阀门的压降。
3
The sub-shell (wrapped in parentheses) performs a series of tasks-albeit sleep delays in this contrived example-and emits output to a Zenity progress meter via a pipe.
sub - shell(包含在括号中)执行一系列任务—在这个人为例子中albeit sleep延迟—且通过一个管道将输出发出到一个Zenity过程表。