So, in the last century, OK, people debated about whether this expansion of space would continue forever; whether it would slow down, you know, will be slowing down, but continue forever; slow down and stop, asymptotically stop; or slow down, stop, and then reverse, so it starts to contract again.
所以，上个世纪，人们辩论 宇宙是否会永远扩张， 是否会减慢， 或者是否会减慢，但是永远进行。 或者减慢并停止，接近停止。 或者减慢，停止，然后在颠倒，再重新收缩。