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。
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。
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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