Any next study must always be associational.

任何下一个研究都必须始终是关联的。

And then when we smell that odorant again, it's like a trigger or a catalyst that will revive the original associational memory.

然后当我们再次闻到那个有气味的东西，它就像一个触发器或催化剂，会唤起最初的联想性记忆。