You can multiply durations by a scalar number to get a longer or shorter duration and can divide by a scalar number or another duration.
可以用时期值乘上一个标量值得到更长或更短的时期值，也可以除一个标量值或者另一个时期。
Spu_rlmask and spu_rlmaska shifts each element of val to the right by the number of bits in the corresponding element of count (or the value of count if count is a scalar).
spu_rlmask和spu_rlmaska会将val的每个元素向右移位，移动的位数是在count中的对应元素中指定的(如果count是一个标量，移动的位数就是count的值)。
The return value from the remote procedure is converted into a standard Perl scalar by call and printed.
远程过程的返回值通过call转换成标准的Perl标量，并打印出来。
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