They are scavengers, which feed on dung and other decaying organic matter, and play an invaluable role in keeping the veld clean.是什么意思_They are scavengers, which feed on dung and other decaying organic matter, and play an invaluable role in keeping the veld clean.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句