Within days of being deposited on a leaf overhanging a stream, tree frog eggs grow into recognizable tadpoles.Bulbous yolk sacs provide nourishment.是什么意思_Within days of being deposited on a leaf overhanging a stream, tree frog eggs grow into recognizable tadpoles.Bulbous yolk sacs provide nourishment.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句