Water may fill a crack in a rock; it freezes when it is very cold and,in doing so,makes the crack wider. Gradually little pieces of rack break away.是什么意思_Water may fill a crack in a rock; it freezes when it is very cold and,in doing so,makes the crack wider. Gradually little pieces of rack break away.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句