考虑一下拥有两双网球鞋：一双轻的比赛用鞋，一双重的训练用鞋(这种技术多年被长跑选手采用)。

Consider owning two pairs of tennis shoes: a lighter game-day shoe and a heavier training shoe (this technique has been used by distance runners for years).

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但在中国，这一双重化的建构是不同步的。

But this process is not synchronous in China.

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同时，姚安、大姚地震序列的重定位结果也说明双差定位法是一种比较好的地震定位方法。

In addition, the relocation results of the Dayao and Yaoan Earthquake sequences also show that the double difference location method is more effective.

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