如果不小心，浏览器的内存需求将在整个浏览会话周期中不断增加。
If you're not careful, the browser's memory demands will grow over the duration of a browsing session.
相反，seam小心地管理那个区段的会话数据的生命周期，并且当conversation终止时，自动清除它们。
Instead, the life cycle of that segment of session data is carefully managed by Seam and it is automatically cleaned up when the conversation terminates.
会话的生命周期相当简单
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