我一直在想,黄昏究竟是怎样一点一点地变成黑夜的?每次看向窗外时总以为还和刚才一样,没想到透明的蓝却已经变成了浓重的深蓝,几乎与黑色完全相同。这似乎有很大的偶然性,因为我两次抬头间隔的时间太长了。但为什么会这样,我也不懂,当我第一次看向窗外之后,总会有各种事情或者念头占据我的脑海,等我再抬头时,外面已经全黑了。这是在教室里的时候,如果不在教室里的话我是根本想不起来看天色的。 I have been wondering, how exactly dusk turns into night? Every time I look out the window always thought and just as before, I did not expect the transparent blue has become a thick dark blue, almost black and completely the same. This seems a lot of chance, because I looked up too long time interval. But why do I do not know, when I first look out the window, there are always things or thoughts that occupy my mind, and when I look up again, the outside is completely dark. This is in the classroom, if not in the classroom, I simply can not remember the sky.