苏联是一个恐惧的文明，人们生活在持续的对夜间敲门声的恐惧中。
The Soviet Union was a civilization of fear, where people lived in constant dread of the knock on the door at night.
Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.
光的原因不在于颜色，而在于光本身。