What do these four things have in common: a proposed wind farm in the American state of Washington, a gold mine in Idaho, a new casino in Las Vegas and ski resort expansions in Vermont. 这四件事有什么共同点:美国华盛顿州拟建的风力发电场,爱达荷州的金矿,拉斯维加斯的一家新赌场和佛蒙特州滑雪胜地的扩张.
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