And they know that the past can hold a key to the future.

他们知道，过去是通向未来的钥匙。

When a particular situation arises, or when his abilities are unusually attuned, we have in the past held unscheduled sessions, and I have always attempted to compensate by cutting the next one short, or cutting it out entirely.

当出现特殊情况，或者当他的能力异常契合的时候，在过去，我们也曾举行过不定期的课，我总是试图通过缩短下一次课的时间，或者完全取消课程以作为补偿。