由于国内市场容量有限，制丝业必须开拓国际市场，以生丝的出口换取棉花等原料的进口。
Owing to the limited demand of the home market, silk industry must be export oriented so as to exchange grege silk with imported raw materials like cotton.
然而，在输电容量有限的电力市场中，发电厂商还可能具有“位置性市场势力”，它与厂商出力的份额没有直接联系。
In power markets with constrained transmission capacities, however, generators may also have locational market power, which has no direct relation with their output shares.
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