Also any data change on a subclass involves two tables: the super class table and the subclass table.

任何子类数据的修改都涉及两张表：超类的表和子类的表。

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The pros include compact tables (no unnecessary nullable columns), data partitions across three subclass tables and easy association with other tables using the top super class table.

优点包括数据表比较紧凑(没有不需要的可空字段)，数据跨三个子类的表进行分区，容易使用超类的表与其他表进行关联。

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This paper analyzes some problems of "YAHOO" s Chinese classification system from several respects, such as installation of the class table, ordering and spread of classifications and so on.

论文从雅虎中国分类体系的类目设置、类目排列、类目展开等方面剖析了其分类体系存在的一些问题。

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People who remember the periodic table of the elements from chemistry class might recognize them.

VOA: special.2010.10.08

You will never in this class have to memorize anything about the periodic table.

这门课并不要求大家去背元素周期表,一点都不要求。

麻省理工公开课 - 化学原理课程节选

These supporters believe that entitlements are fine as long as the rich pay for them, but what happens when the poor and middle class are called to the table to pay?

FORBES: The Liberal Left's Dirty Little Secret: The Middle Class and Poor Pay For the Entitlement State

The Rays were 3-0 down at the end of the first period against Nottingham but hauled themselves back into the game to trail 5-4 just a minute into the final period after Kozak's brace and further strikes from Jeff Glowa and Matt Reynolds but the Panthers showed their class to go top of the table with two late goals.

BBC: Kozak returns as Stingrays lose

With the boom in global demand for alternative-fueled vehicles, now may be a good time to break out your Periodic Table of Elements from science class.

FORBES: Chile Gets A Charge From Lithium