儿童掌握数字词汇的概念需要付出很大的努力。
It takes great efforts for children to grasp the concept of number words.
他一直在努力寻找合适的方程来描述他的新引力概念，这些方程将定义物体如何在空间中移动，以及物体是如何扭曲空间的。
He was struggling to find the right equations that would describe his new concept of gravity, ones that would define how objects move through space and how space is curved by objects.
我们只需要在向词汇表添加新概念或目标设定时努力定义其含义和用途就可以了。
We simply need to strive to define meaning and useful purpose when adding a new concept or goal set to our vocabulary.
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