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a waste of+名词，表示浪费什么什么。
a waste of time浪费时间
a waste of money浪费金钱
例：I think watching TV every evening is a waste of time.
我认为每天晚上看电视是浪费时间。
Don't you think it's a waste of effort to argue about that small thing?
难道你不认为为了那件小事争吵是浪费力气吗？
末尾音乐：same girl.