雅思詞匯：各種疊詞

　　back and forth 來來回回的;

　　flesh and blood 血肉之軀;

　　heavy and light 輕重;

　　iron and steel 鋼鐵;

　　night and day 夜以繼日的;

　　off and on 斷斷續(xù)續(xù)的;

　　old and young 無論老少;

　　one and only 唯一;

　　rain or shine 不論陰晴;

　　twos and threes 三三兩兩