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n(1)循環(huán)(series of related events repeating in a regular order)[C]：the～of the seasons/birth and death/economic booms and slumps季節(jié)/生與死/經(jīng)濟繁榮與蕭條的循環(huán);the trade～貿(mào)易循環(huán);a vicious～惡性循環(huán);Life follows its usual～： birth，youth，old age and death.生命總是遵循由出生、青年、老年直至死亡的過程發(fā)展。

(2)周期(period of time needed for this to be completed)[C]：a 50-second～50秒的周期;a～of alternating current交流電的周期;the gasoline-engine/breeding/sunspot～汽油機/繁殖/太陽黑子的周期;

(3)系列，全集(套)(complete set or series，eg of songs or poems，that deal with a single theme or hero)[C]：a (Schubert) song～(舒伯特)組歌;the Arthurian～寫亞瑟王的系列作品;the～of events leading to Hitler's downfall導致希特勒倒臺的一系列事件;〖同〗series;

(4)自行車，摩托車等(bicycle，motor-cycle，etc)[C，U(by～)](infml)：a～shop/race/path自行(摩托)車商店/自行(摩托)車賽/自行(摩托)車道;My～is broken.我的自行(摩托)車壞了。go by～乘自行(摩托)車去;

→′cyclic adj 循環(huán)的，周期性的;′cyclically adv 循環(huán)(周期性)地;′cyclist n騎自行車的人;

vi騎自行(摩托)車(ride a bicycle or motor-cycle)[I，I+prep，I+adv]：go～ing騎自行(摩托)車去;～to work騎自行(摩托)車去工作;～along(a road)/into town/off home/away騎自行(摩托)車(沿路)往前走/進城/回家/離去;recommend～ing as a good form of exercise把騎自行(摩托)車推薦為一種運動的好方式;

【說明】見BICYCLE。