如果每天骑自行车可以让你更健康，为什么不承诺每天坚持骑车，过上更健康的生活呢？

If cycling each day can make you healthier, why not commit yourself to it and have a better life?

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对他来说，梅德韦杰夫先生已经承诺坚持他的前任的“成功”的政策。

For his part, Mr Medvedev has promised to stick to the "successful" policies of his predecessor.

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双方决心坚持这些承诺。

The two sides resolve to stand behind these commitments.

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