一方要将骨牌反抠，使彩色的一面朝上，这样，对方就看不见带点数的那一面。
A player holds the colored side up to prevent an opponent from seeing the dotted Numbers side.
谷歌计划让用户旋转一个物品(例如茶壶)的图像使之正确地朝上。
Google has a scheme in which the user must rotate an image of an object (a teapot, say) to make it the right way up.
如果奶牛翻转瓷砖，使所有白面朝上，则会得到奖励。
The cows are rewarded when they flip the tiles so that each tile has the white side face up.
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