劍橋詞典the cooling of the water in the central and eastern Pacific Ocean that happens every few years and that affects the weather in many places 拉尼娜現象（太平洋東部和中部海水變冷的現象，每隔幾年發(fā)生，對很多地區(qū)氣候產生影響） 返回 la Ni?a