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。

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Watt-Hour Meter A watt-hour meter records the total power output at a specific point in a system. Typical recording increment is in kW-hours.

电度表电度表记录系统中某一点的总电力输出，通常以千瓦时为记录单位。

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This digital display meter may directly connect with a transistor- output PLC and display data of PLC system.

该数显仪表可以直接和晶体管输出型的各类PLC连接，实现PLC系统的数据显示功能。

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That might be about to change, though, as South Korea's state-owned Korea Electronics Technology Institute has announced a new image sensor chip that promises to take "vibrant photos" in extreme low-light conditions -- all the way down to 1 lux, which is the equivalent light output of a candle shining one meter away.

ENGADGET: South Korean image-sensing chip enables 1-lux photography