Sleet is part of a person's daily activity cycle.
睡眠是人日常活动周期的一部分。
The sun's activity usually ebbs and flows on a fairly predictable cycle.
太阳的活动通常在一个还算规则的周期内上下浮动。
A second cycle is the self-loop of Task 2, which USES activity form.
第二个循环是Task2的自循环，它采用活动形式。
Coloring and Reading Activity: Life cycle of a butterfly.
涂色与阅读活动：蝴蝶的生长周期。
Coloring and Reading Activity: Life cycle of a butterfly.
涂色与阅读活动：蝴蝶的生长周期。
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