For example, you can print some basic information on the xterm title bar using the echo command.
例如，可以使用echo命令在xterm标题栏上显示一些基本信息。
We wanted this to echo "fooThis is my environment variable!bar", but it didn't work.
我们希望回显 "fooThis ismyenvironmentvariable!bar"，但却不是这样。
The principle of detector is that the A-Scan flaw instrument of USL32 beams the ultrasonic to detect the bar material with the method of pulse echo once.
该系统采用A型超声波探伤仪产生超声波脉冲，采用一次脉冲反射法检测棒材。
The principle of detector is that the A-Scan flaw instrument of USL32 beams the ultrasonic to detect the bar material with the method of pulse echo once.
该系统采用A型超声波探伤仪产生超声波脉冲，采用一次脉冲反射法检测棒材。
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