It takes great efforts for children to grasp the concept of number words.
儿童掌握数字词汇的概念需要付出很大的努力。
References to any number of concept topics.
对概念主题的引用，个数不限。
Number is a crucial but elusive concept in English teaching and learning.
数是英语教学中的一个关键而又难以捉摸的概念。
First, analysis is based upon the concept of number.
第一，分析学立足于数的概念。
In the analysis, the concept of condition number of matrix is used.
在分析中，使用了矩阵条件数概念。
The concept of Fresnel number is also discussed.
并对菲涅耳数这一物理概念进行了论述。
A number of different experimental approaches have aided in validating the concept.
许多不同的实验方法，有助于确证这种概念。
A number of different experimental approaches have aided in validating the concept.
许多不同的实验方法，有助于确证这种概念。
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