When you truly believe that each moment is unique, then by definition there isn't anything in your mind for the associationmechanism to link that moment to.
一旦你真的相信每个时刻都是独特的，那么根据定义来说，没有什么东西可以联想了。
2
The mechanism behind the association remains unclear, however.
不过，联想背后的机制还不清楚。
3
Review of the suggested -association, and of the -purported mechanism(s), which might include immune-mediated disease, with or without a genetic basis should continue.