自20世纪70年代中期以来，出现了一种不同的策略。

Since the mid-1970's, a different strategy has emerged.

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在20世纪90年代中期美国为探索这颗红色星球开始了一项新的策略。

In the mid-1990s the U.S. embarked on a new strategy for exploring the Red Planet.

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套利策略中期现套利的关键是构建目标指数的现货组合。

Therefore it is important to make a spot portfolio which can trace the index.

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套利策略中期现套利的关键是构建目标指数的现货组合。

Therefore it is important to make a spot portfolio which can trace the index.

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