They are also called basic tools and have some common features.
它们也被称为基本工具，并且具有一些共同的特性。
Science and technology is one of the most basic mathematical tools.
也是科学技术中最基本的数学工具之一。
English and computer skills are two basic tools for the 21st century.
掌握英语和计算机技能是二十一世纪的基本要求。
English and computer skills are two basic tools for the 21st century.
掌握英语和计算机技能是二十一世纪的基本要求。
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