what-if

n.

假设分析，作假定推测；

1. What he said is a pure hypothesis.
   他所说的纯粹是假设。
2. Soppose you should contradict yourself,what then?
   假设你说了，那又怎么样呢？

1. That left a question of what the ancestor of the arthropods looked like.
   许多学者据现有的线索，提出节肢动物理论上假设的祖先，但结果很不一致。

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