If the threat of rabies arose every five years, targeting all the wolves in the corridors would cut the risk of extinction over a20- year period by fourfold.是什么意思_If the threat of rabies arose every five years, targeting all the wolves in the corridors would cut the risk of extinction over a20- year period by fourfold.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句