They watch birds in the wetlands.They study plant life in the rich forests of oak and maple trees.The smooth sands of the dunes and lakeshore make a clear musical sound when people walk on them.是什么意思_They watch birds in the wetlands.They study plant life in the rich forests of oak and maple trees.The smooth sands of the dunes and lakeshore make a clear musical sound when people walk on them.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句