Definition: used to ask about the reason for something Level: B2
这些工具是做什么用的？
___What are these tools ___for?
你为什么做那个？
___What are you doing that ___for?
人们喜欢花时间在闷热的车里，陷入交通堵塞，呼吸污染的空气。这是为了什么？
People love spending hours in their stuffy cars, getting stuck in traffic jams and breathing polluted air. ___What ___for?
