Too many marathoners emphasize volume of training over quality.

太多的马拉松人强调训练的数量而不是品质。

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Combining both frequency and duration refers to the volume of training, thus much easier to quantify.

频率和持续时间的结合指的是训练量，这很容易量化。

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After an initial week of recovery, she gradually added quality and volume back into her training, and continued long runs.

在开始一周的恢复后，她逐渐增加了训练的数量和质量，坚持长距离跑步。

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