外侧半月板径向移位数量及程度明显低于内侧半月板。

The number and degree of displacement of lateral meniscus were much lower than those of medial meniscus.

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spu_rl 会对 val 的每个元素进行向左循环移位，移动的位数是在 count 的对应元素中指定的。

spu_rl rotates each element of val left by the number of bits specified in the corresponding element of count.

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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)。

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).

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