They were friends in college, but then they moved to different cities and lost touch.他们在大学里是朋友，但后来搬到不同的城市后就失去联系了。

She lost touch with her college roommate after graduation.毕业后她就和大学的室友失去联系了。

I read the newspaper every morning so that I don't completely lose touch with what's happening in the world.我每天早上都读报纸，这样就不会完全不知道世界上正在发生什么。

She seems to have lost touch with reality [=she believes things that are not true] and thinks that she can have everything she wants.她似乎已经跟现实脱节了，以为能拥有想要的一切。