You should understand the basic concepts of tablespaces, tables, and columns.

您应当理解表空间、表和列的基本概念。

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Simple searches and transactions affecting single rows and single tables, and modification of basic field types should not cause any errors.

影响个别行和表的简单查询和事务，以及修改基本的字段类型可能不会产生错误。

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These three chains are the main chains built-in by default inside basic packet-filtering tables.

这三个链是基本信息包过滤表中内置的缺省主链。

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"Indeed in our view such competence is central to the success of primary mathematics, so much so that we would recommend an earlier emphasis for the mastery of some basic skills such as multiplication tables, " he said in a paper due to be published later this week.

BBC: Primary maths plan threatens 'too much too soon'