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浪费时间金钱的无用机构；毫无意义的活动
People sometimes refer to an official organization or activity as a boondoggle when they think it wastes a lot of time and money and does not achieve much.
例句
The new runway is a billion-dollar boondoggle.
新的机场跑道耗资10亿美元，却没什么大用处。