增量减速，说到做到，其它听天由命。距离从5k加到5迈，目标配速8:30。

Splits: 8:36, 8:31, 8:28, 8:28, 8:26.

老朋友们

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Confession: The average pace was 8:28 towards the very end. So I waited a few seconds to get 8:30. ^_^