因此要找到满足 select 语句中谓词的行，这个优化器必须将主表中的所有行上锁、读取它们的值并与谓词中提供的值进行比较。

So to find the row that satisfies the predicate in the select statement, the optimizer has to lock, read in, and compare all the rows in the main table with the value supplied in the predicate.

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可以也拆分编辑器屏幕或者水平或垂直比较行。

You can also split the editor screen either horizontally or vertically to compare lines.

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一般而言这种机器的显示屏比较大型机显示器的显示行要少在强光下读起来困难。

Typically, their display screens show fewer lines than displays on larger computers and can be difficult to read in bright light.

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