The past is the past for a reason.

过去的事就随它去。

Because the past is the past for a reason.

过去的事就过去了，都是天意。

The past is the past, don't miss nothing else.

过去就是过去了，不要留恋镜花水月。

Error of the past is the wisdom and success of the future.

过去的错误是未来的才智和成功。（前车之覆，后车之鉴。）（失败是成功之母。）

The mutability of the past is the central tenet of Ingsoc.

窜改过去是英社的中心原则.

Since the past is the past, and we can’t go back and change it ,is it possible to change our reality and our perception of the world?

过去的已经过去，我们不能回溯时间去改变它，那么，我们还可不可以做到，改变我们生活的现实或者我们对世界的看法吗？

The past is the accumulated knowledge as the me and the we, they and us.

过去是知识的累积，作为我和我们，他们和我们。

In English grammar, the future-in-the-past is the use of would or was/were going to to refer to the future from the perspective of some point in the past.

在英语语法里，一般过去将来时使用would或was/were going to去描述过去某个时间点对未来的看法。

The past is the moody servant of memory , unchangeable yet doomed to folllow countless masters.

昔日是喜怒无常的仆人, 难以改变都注定对它的无数个主人亦步亦趋.

Central to all the equilibria concepts studied in the past is the notion of a selfish player who wants to maximize her own profit.

以往的“均衡”概念的核心皆在于假设博弈方是自私的，目标为最大化自己的利益。