After testing different combinations, they chose two materials that worked: a silver-plated yarn that can light up and a kind of thread that conducts electricity.

在测试了不同的组合后，他们选择了两种有用的材料：一种可以发光的镀银纱和一种导电的线。

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Isoquant curve is a line showing all the alternative combinations of two factors that can produce a given level of output.

等产量线是表示两种生产要素的不同数量组合可以带来相等产量的一条曲线。

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These two combinations will do have a greater representative and influence if they are integrated in certain way.

这两个兴起的大国组合如能以某种形式合作，其代表性和影响力势将更有生命力。

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Because everyone has two copies of each gene -- one from each parent -- there are six possible combinations.

WSJ: A Gene Gives a Hint Of How Long a Person Might Hope to Live