The table might contain four columns.

此表可能包含以下四列。

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Within each row are four columns, which come from.

每一行内均有四列，分别取自。

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We will create a table named CLIENTS with four columns.

我们将创建一个有4个列的名为CLIENTS的表。

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So his plans included specifications for a printer almost as complicated as the calculating engine itself, with adjustable margins, two separate fonts, and the ability to print in two, three or four columns.

ECONOMIST: The world��s latest computer

The weight of the building is supported entirely by 12 stout outer columns, which form the square perimeter of the building, plus four inner columns at the corners of a smaller, inner square.

ECONOMIST: AN ENGINEERING MYSTERY

Built in 1935, it is white clapboard, with black shutters and four Corinthian columns.

NEWYORKER: Bones of Contention