今天，有一位客人参观学校。听一听，打钩或打叉。
Today, there is a guest visiting the school. Listen and tick or cross.
为了得到可变的位率，在分形图像压缩中经常采用四叉树分割方法。
Quadtree partitions are often used in fractal image compression to achieve variable bit rates.
您还可以在查询中联接客户和订单，方法是构建叉积并将所有相关数据位作为一个大型投影检索出来。
You can also join customers and orders in a query by forming the cross-product and retrieving all the relative bits of data as one large projection.
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