我想发明一个多功能背包,这样出去游玩就方便了。这个包上有个黑色按键。你喜欢什么颜色就按一下这个黑色的按键,把颜色的汉语拼音写进去,包就会变成你要的颜色了。在游玩中,你可能会去爬山,如果你累了,就把包下面的一个袋子打开。这个袋子会弹出四个轮子,然后你坐上去按一个白色的键,它的轮子就可以像汽车一样开了,而且不用人来掌控。如果你遇到了下雨天又没有 I want to invent a versatile backpack, so go out and play on the convenience. This bag has a black button. What color do you like to click on the black button, the color of the pinyin into it, the package will become the color you want. During the game, you may go hiking, if you are tired, put a bag under the bag open. The bag will pop up four wheels, then you sit up and press a white key, its wheels can be opened like a car, and no one to control. If you have a rainy day without it