I am invisible, yet I make things clear, I can be shallow or deep, bringing distant things near. In silence, I speak, and in stillness, I show, reflecting both light and the darkness below. Without me, you stumble, yet too much and you’re blind, always ahead, but often behind. What am I? $ t/ ~) Z6 h, v7 h6 [$ I5 R1 M g7 v: I2 z/ k# h7 p( {(欢迎访问老王论坛:laowang.vip)
这个是什么啊?