One problem for the emerging technology is cost, even in the aftermath of a sharp fall in solar panel prices, following a global glut of the main raw material, solar-grade silicon.
这种新兴技术的难点就是成本，即使太阳能板的价格大幅下跌，随之而来的问题就是稀有材料太阳级多晶硅在全球供不应求。
Meanwhile, common cast iron was used as the main material of the die so that the manufacture cost was lowered.
同时，由于采用普通铸铁作为模具主体材料，降低了成本。
Not only German beer producers, but Mexican tortilla makers have see the cost of their main raw material growing quickly to historical highs.
不仅德国的啤酒制造商，而且墨西哥的玉米饼生产者，都已注意到他们主要的原材料成本增长迅速，已达历史最高水平。
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