丙酸由于转化速度较慢，在后期会有一个逐渐积累的过程。
Propionic acid as a slow transformation, there will be a gradual accumulation in the latter part of the process.
运动量、运动强度也要由小到大，并在锻炼过程中逐渐积累经验，掌握好运动量，以期达到自我身体锻炼的最佳效果。
He shall gradually increase sport amount and strength, and gradually accumulate experience and master sport amount during exercise to reach own best effect of body exercise.
改进的过程是逐渐积累的。
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