A new report from the International Union for the Conservation of Nature (IUCN) lists one in four land mammals as endangered, as well as one in three marine mammals.是什么意思_A new report from the International Union for the Conservation of Nature (IUCN) lists one in four land mammals as endangered, as well as one in three marine mammals.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句