1. This cycle of seasons became the year.
    各季节循环一周期就成为一年。

2. Then they feel guilty and they start the whole cycle over again."
    随后他们就感到内疚，接着他们就再把这个全过程重复一遍。"

3. He showed that the average individual´s sleep cycle is punctuated with peculiar bursts of eye-movements,
    他指出，平常人的睡眠周期中不时伴有一阵阵奇怪的眼球队活动，

4. And upsetting the natural water cycle (循环) on Earth makes significant problems for its inhabitants.
    扰乱地球上水的自然循环会对它的居民造成严重问题。

5. I go to school by cycle every day.
    我每天骑自行车上学。