即将与他们匹配的涡轮戒指完成后，这些曲柄同时具备三重，双和两个戒指和后卫的组合方案。

Coming complete with their matching Turbine rings, these cranks are available in both triple, double and two ring and guard combination options.

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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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