phenomenon n. 1.(pl. -na ) 【哲学】现象 (opp. noumenon); 事件。 2.(pl. phenomenons) 稀有现象;奇迹;珍奇;珍品;非凡的人。 3.【医学】症候。 the phenomenon of nature 自然现象。 social phenomenon 社会现象。 an infant phenomenon 神童。
Tthe quasi - biennial oscillation , an oscillating phenomenon in which the wind in the upper atmosphere over the tropics changes its direction from east to west and then back to east about every two years 准两年振荡发生在赤道附近的高空,分为西风异常和东风异常两个交替出现的位相,周期约为两年。