at all events:used to emphasize or show that sth is true or will happen in spite of other circumstances 强调事实的真实性；在其他任何环境下也是真实的（横向）
at any rate:use to say that a particular fact is true in spite of what happened in the past or what may happen in the future.强调某个特殊事实在过去某种情况下是真的 在将来某个时候也是真的（纵向）
at all costs：whatever is needed to achieve sth 为了达到目的而不惜任何代价.