对于被合并的表的分区键内的每列，必须存在一个同等连接的谓语。
For each column in the partitioning key of the joined tables, an equijoin predicate must exist.
如果基于查询工作负载选择一个分区键，那么此分区键通常应该包含一个合并列或常被用于很多查询的一组列。
If you choose a partitioning key based on your query workload, the partitioning key should typically consist of either a joined column or a set of columns that is frequently used in many queries.
基于数据模型，选择那些有利于频繁合并且基于主键的分区键。
Based on your data model, you should select partitioning keys that favor frequent joins and that are based on a primary key.
许多驱动程序会导出这些信息到sysfs,udev允许我们使用ATTR键通过稍捎不同的语法来合并sysfs匹配到自己的规则中。
Many drivers export information like this into sysfs, and udev allows us to incorporate sysfs-matching into our rules, using the ATTR key with a slightly different syntax.
所以它是沿着键轴方向的,而且这里是一个碳sp2杂化轨道，和一个氢的1s轨道的结合,在这里我们可以合并他们。
So it's along the bond axis and it's between a carbon s p 2 hybrid, and then the hydrogen is just a 1 s orbital that we're combining here.
关于笔形键的设计：我们发现许多用户并不经常使用这个键。所以我们将原来笔形键的功能和设置菜单进行了合并。
Question about pencil key: it was found that many users don't use it very much, so the same functionality got embedded into the Options menu.
这种复合并不是简单的有机相与无机相的混合，而是二者在纳米范围内通过化学键结合而成。
This is not the simple organic compound and inorganic hybrid, but both are in nanometer range by chemical combination.
这种复合并不是简单的有机相与无机相的混合，而是二者在纳米范围内通过化学键结合而成。
This is not the simple organic compound and inorganic hybrid, but both are in nanometer range by chemical combination.
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