and is detected. 被捕食者察觉

284. of the very thing that has led to the pigeon's success...
     鸽子在城市得以成功生存的法宝
285. Their lack of fear.
     它们已丧失的恐惧感
286. As the pigeons bathe, oil from their plumage flows downstream,
     鸽子洗澡时 羽毛上的油脂顺流而下
287. and is detected.
     被捕食者察觉
288. A monstrous Wels catfish.
     一条巨大的六须鲶鱼
289. Introduced here just 40 years ago,
     虽然才被引入此地四十年
290. they have proliferated. Virtually exterminated the local fish stocks...
     繁殖数量却已大大增长 几乎迫使本地鱼类灭绝

来自《行星地球 第二季 第六集 Planet Earth S02E06 城市》第 287 行