书架总长度275千米。
量子态是向量，我们并不关心其总长度(只要不是0)。
A quantum state is a vector whose overall length is of no interest to us (as long as it's not zero).
她说，以总长度计，原创制作所占比例仍然很小。
'Original production is still a tiny fraction in terms of total lengths,' she said.
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