The pivot row must be selected so that all the other basic variables remain positive.

必须选择枢轴行，以便所有其他基本变量保持正数。

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It is quite usual for a slow reader to double and even triple his reading efficiency during a two-day class offering a positive atmosphere, carefully selected texts and comprehension tests.

通过提供积极的气氛，经仔细挑选的文章一级理解力测试，这样一个持续两天的课程将慢速读者的阅读速度提高到原来的两倍甚至三倍，是很常见的。

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The examples in the following table have been specially selected as likely to provide an immediate positive experience.

下表中的示例是专门选择的，很可能为您提供及时的正面体验。

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The four stocks I have selected from the list have the most positive relative performance, or RS analysis patterns.

FORBES: The S&P 500's Most Overbought Stocks

Jenny Buccos, chosen from a from a pool of more than 1, 500 candidates nominated through the White House web site, was selected as a Champion of Change for the positive impact she is making in her community.

WHITEHOUSE: Teaching Global Citizenship

Terri Turner, chosen from a from a pool of more than 1, 500 candidates nominated through the White House web site, was selected as a Champion of Change for the positive impact she is making in her community.

WHITEHOUSE: ��No�� Can Be a Good Thing