It's sad when people you know become people you knew.
当那些曾经熟悉的人变得不再熟悉，那是多么哀伤。

When you can walk right past someone like they were never a big part of your life.
曾经他们是你生命中一个重要的部分，而现在，你经过他们也不打招呼；

How you used to be able to talk for hours and how now,
you can barely even look at them.
曾经你们能畅谈许久，而现在，你甚至都不再看他们一眼；
　　
It's sad how times change.
时光流逝，是多么悲哀。