测量长度
Measuring length
将三个物体按长度排序，并借助第三个物体间接比较两个物体的长度
Order three objects by length and compare the lengths of two objects indirectly using a third object
学习证据 / Evidence
- 把三条丝带按从最短到最长的顺序排列
- 用一根绳子比较两个无法并排摆放的物体的高度
- 说明：如果甲比乙长，乙比丙长，那么甲比丙长
- Put three ribbons in order from shortest to longest
- Use a piece of string to compare the heights of two objects that cannot be placed side by side
- Explain that if A is longer than B and B is longer than C, then A is longer than C
评估问题 / Assessment
如果{{name}}有三支不同长度的铅笔，但每次只能比较两支，{{name}}能借助第三支铅笔作为中介，判断出哪支最长吗？
If {{name}} has three pencils of different lengths but can only compare two at a time, can they figure out which is longest — by using a third pencil as a go-between?