在规划门户项目时，各个集团通常基于假设、经验和预期来调整规模。
When planning a portal project, groups usually do sizings based on assumptions, experience, and expectations.
他们假设这是所有的经验，在这个世界上的。
They assumed that that's all the experience there were in the world.
你从未看见过一种黑色的天鹅，所以你通过生活经验假设没有黑天鹅存在。
You've never seen a black swan. So, you end up going through life assuming that there are no black swans.
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