糖能快速缓解饥饿感，但不提供持久的营养。

Sugar gives quick relief to hunger but provides no lasting nourishment.

《柯林斯英汉双解大词典》

相反，它只需要程序员将属性标记为持久性的，并识别出能代表对象唯一标识符(或者主键)的属性。

Instead, it requires the developer only to denote the attributes to be persisted and to identify the attribute to represent the object's unique identifier (or primary key).

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这次短期的研究显示无线传感器网络系统能附加在现存的结构体上，但它让其它工程师产生了疑惑，这些网络系统在苛刻的条件下持久性是如何呢。

This short-lived study showed that wireless sensor networks could be added to existing structures, but it left other engineers wondering how durable such networks would be in demanding conditions.

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I call this the broaden-and-build theory of positive emotions because positive emotions appear to broaden people's momentary thought action repertoire and build the enduring personal resources.

我称其为积极情绪的扩建理论,因为积极情绪似乎能扩展人们的瞬间想法,和动作指令库并建立持久的个人资源。

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