A particular animal typically maintains its own characteristic cycle duration with great precision for many days.
某一种动物通常可以在很多天内极其精确地保持其特有的周期时间。
So to create useful interactions with users with a duration of longer than a single request-response cycle, session state must be maintained somewhere.
因此，如果要创建比一个请求-响应周期更长的有用交互，就必须存储会话状态。
For the duration of its cycle, though, this deep-sea carbon is locked away.
然而在整个周期里，深海里的碳是被锁藏的。
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