We may not yet have the flying cars science fiction promised us, but we can have walls that change color depending on temperature, keyboards that roll up, and windows that become opaque at the flick of a switch.
或许我们还看不到科幻小说内所描述的会飞的汽车， 但是我们能看到 会随温度变色的墙， 可以卷起来的键盘， 和一摁开关就变不透明的窗户。