Walter resigns from 3M and moves into nature conservation working for a minerals magnate who wants to turn some of his ill-earned millions into saving a small woodland bird, the Cerulean warbler.
有一位矿产富豪想拿出一部分钱来挽救一种名为“深蓝色林莺”的濒危鸟类，沃尔特辞去了3M的工作，为他做自然保护工作。
A small wood warbler (Vermivora peregrina) of North America, having greenish upper parts and a white underside.
田纳西剌嘴莺：产于北美的一种小型(灰绿虫森莺)，其羽毛上部为绿色，下部呈白色。
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