没有积累的成本，如果您需要一种以上的媒体支持。
No accumulated cost if you need more than one type media supported.
资本积累本身能够在长期内支持人均产出的增长。
Capital accumulation by itself can sustain growth in output per worker in the long term.
资本积累本身能够在长期内支持人均产出的增长。
Capital accumulation by itself can sustain growth in output per worker in the long term.
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