线表：文字或数字分栏排，并用线隔开，方便查阅。
Table: Columns of text or figures separated with rule for ease of reference.
三线表因其结构简明、排版方便等优点在科技期刊中广泛使用，但在不少期刊中三线表的使用存在一些错误。
Tables with three lines are used extensively for their advantages, such as the simple structure and convenience in composition. But some mistakes exist in the tables with three lines of many journals.
沿着周期表的对角线的中间有大约包含六个元素的元素组。
There is this group of about half a dozen right down the diagonal middle of the periodic chart.
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