上面图片表示的第一种方式，是增加质量(用虚线的圆形来表示)，抛开两种同样大小的相反力。
The first way shown in the top figure, is to increase the mass (as indicated by the dotted circle), leaving the two opposing forces the same.
用一整页呈现出所有食物的卡通动画图片，都是他们刚才所列举出的能用英语表达的食物的单词，复习一下这些学过的表示食物的词汇。
Ask the students to show their food lists. At the same time, show many cartoon pictures on food that the students have learned.
在古代，人们用各种各样的方法记录数字，就像这些图片所表示的数字6一样。
In ancient times, people wrote Numbers in many different ways, as these pictures of the number 6 show.
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