这项功能只在重构之后一段时间内有效。
Although this offer is only good for a limited time after refactoring.
人们经常在刚开始的阶段就受伤，然后一段时间内不能再进行训练。
Often, people get injured in the first few sessions and then are unable to train again for a while.
人们经常在刚开始的阶段就受伤，然后一段时间内不能再进行训练。
Often, people get injured in the first few sessions and then are unable to train again for a while.
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