这个动力帮助规划完成主要的工作（一件好事），但是它也可能是规划抵抗方向上的变化。
This momentum helps programs accomplish major amounts of work (a good thing), but it can also make programs resistant to changes in direction.
虽然证明是灾难性的变化可能对许多人来说，改变也可能是一件好事，为他人。
Although change may prove devastating to many, change may also be a good thing for others.
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