The loop including line 3 of the listing is working through the keys received, getting a corresponding value, and printing it as an array or a string.
包含清单第3行的循环将遍历接收到的键，获得相应值，并把它作为数组或字符串输出。
The loop through the keys of %discs is simple, using grep() to see if a disc is in @common.
循环遍历 %discs的键很简单，用grep()来查看一个唱片是否在于 @common 中。
This loop traverses the keys in directory, which are tuples.
上面这个循环会遍历字典中的键，这些键都是元组。
In the process of signal digital intermediate-frequency received, digital down convertion, frequency tracking of carrier and phase locked loop are the keys.
在信号的中频数字接收过程中，数字下变频、载波频率与相位跟踪是设计的关键所在。
The calculation of required velocity is one of the keys to realize closed loop guidance.
实现闭路制导的关键之一是需要速度的求解。
Controller is designed based on VHDL, the research keys are the implementation of the on-line learning algorithm of CMAC and the closed-loop simulation test of the controller.
基于VHDL设计该控制器，重点在于CMAC的在线学习算法实现和控制器模块的闭环仿真测试。
Controller is designed based on VHDL, the research keys are the implementation of the on-line learning algorithm of CMAC and the closed-loop simulation test of the controller.
基于VHDL设计该控制器，重点在于CMAC的在线学习算法实现和控制器模块的闭环仿真测试。
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