2000多年前,这里的人们创造出一种灌溉设施——____ ,被人们称为“____ ”。
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Mind maps are a great way of showing a picture of information.They work very well in all kinds of learning.Here is an example to show us how to draw a mind map.
To make the mind map even better,use color to show important ideas or parts of the map.
计算:16.9÷26