保存在会话中的数据的生命期，最长是从用户访问域的那一刻到用户在预设的一段不活动时间之后超时的那一刻。
The life span of the data saved to a session is, at most, from the moment the user accesses a domain to the moment when a user times out after a preset amount of time of inactivity.
这一刻你也许很难过，下一刻你也许会对你毫无结果的努力、白白浪费的时间和看到别人轻松的生活而倍感挫败。
One minute you might feel very sad, the next minute you may become frustrated with your fruitless efforts, time-wasting and seeing how everybody else seems to find life so easy.
旅程就是乐趣的所在，给自己时间来享受这一刻，因为只有在这一刻我们才拥有它。
The journey is where the fun is, so give yourself time to be present in this moment because this moment is all we will ever have.
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