As the bit drills down, pipe is added length after length.
随着钻头往下钻，管子一段一段地加接上去。
If either bound is negative, the sequence's length is added to it.
如果任一限是负的，就加上序列的长度。
If it is negative, the sequence's length is added to it.
如果是负数，序列的长度就被加上。
If it is negative, the sequence's length is added to it.
如果是负数，序列的长度就被加上。
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