what-if的用法和樣例：
例句
用作名詞 (n.)
- What he said is a pure hypothesis.
他所說(shuō)的純粹是假設。 - Soppose you should contradict yourself,what then?
假設你說(shuō)了，那又怎么樣呢？
用作形容詞 (adj.)
- That left a question of what the ancestor of the arthropods looked like.
許多學(xué)者據現有的線(xiàn)索，提出節肢動(dòng)物理論上假設的祖先，但結果很不一致。
