One critical variable is the value of PATH, which you can check at the command line with the echo $PATH command.
一个临界变数是路径的数值，你以回声$路径指令能在指令行检查。
If you're appending only a single line instead of multiple lines or an entire file, you can use echo instead of cat.
如果您仅追加单行而不是多行或整个文件，您可以使用echo而不是cat。
Did you also notice the use of double-quoted strings instead of single-quoted strings on the echo line?
另外，你注意到在echo一行它使用了双引号而不是单引号吗？
You also find that each line, each vertex has an echo, it expands to something else; a change of color or texture, or a simple line drawn over the floor. Another gesture that connects with the whole.
你还会发现每个线条和每个顶点都有回应，它扩展到别的东西：可能是颜色或纹理的改变，或者是地板上画的简单线条，它们都以另一种姿态与整体相连。
When you realize that, and you start paying attention to some of those other charts, you begin to see how they tend to line up with one another in weird ways, and sort of echo the same things.
当你意识到这一点，并开始注意到其他星盘时，你会发现它们相互关联，反映着相同的事情。
The implementation contains two parts: one is changing the distribution of the current by controlling the length of transmission line to controlling echo direction of the patch;
其实现方法包含两部分：一是通过改变微带传输线长度进而改变电流分布来控制阵元贴片的回波方向；
The implementation contains two parts: one is changing the distribution of the current by controlling the length of transmission line to controlling echo direction of the patch;
其实现方法包含两部分：一是通过改变微带传输线长度进而改变电流分布来控制阵元贴片的回波方向；
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