life cycle的复数形式怎么拼写

life cycle的音标：life cycle的英式发音音标为：[laif 'saikl]life cycle的美式发音音标为：[laɪf 'saɪkəl]...

Each new product would have a relatively long life cycle.每种新产品都将会有相对较长的生命周期。the life cycle of the butterfly蝴蝶的生活周期This plant effloresces only once during its life cycle.这植物在其生活史中只开花一次....

n.生活周期，经济周期...