没人能知道产品第一个月能卖多少银子。

People never know how much money they're going to make in the first month when their product goes on sale.

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所有产品第一次开料前需要经客户确认一套样板。

Every first cutting must have a pre-production review.

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系统开发的重复特性意味着，产品第一次不会被完成，但会持续地进展。

The iterative character of system development implies that the product is not completed the first time, but continuously evolves.

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