雅思詞匯：那些疊詞

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