包括了一个演示这个函数用法的演示应用程序。
A demo application illustrating the use of the function has been included.
注意此处printk的用法：这是内核的printf函数。
Note the use of printk here: this is the kernel printf function.
到目前以止，我已经向大家介绍了 $()函数的三种用法。
So far, I've shown you three different ways to use the $() function.
同时该函数的用法进行了扩展和压缩。
The utility of this function has also expanded and contracted at the same time.
位移函数不准有任何优先用法。
The displacement function must not have any preferred direction.
位移函数不准有任何优先用法。
The displacement function must not have any preferred direction .
位移函数不准有任何优先用法。
The displacement function must not have any preferred direction .
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