主要原因是在开发的早期阶段，您并不了解您需要为某个描述完成的实际工作量。
The main reason is that in the early stages of development, you don't know how much work you really have for a story.
主要原因是在开发的早期阶段，您并不了解您需要为某个描述完成的实际工作量。
The main reason is that in the early stages of development, you don't know how much work you really have for a story.
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