老师教书有着各种各样的目的和动机。
I have mentioned before, teachers teach for a variety of reasons and each teacher has his or her motivation.
他教会我很多东西没有任何目的和动机。
He taught me a lot of things without any purpose and motivation.
这提供了一个目的和动机，找到更好的建筑材料，提供更好的保护和抵抗天气。
This provides a purpose and motivation to find better building materials that offer better protection and resistance to weather.
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