在心理学上，邮件是变动间隔强化：我们不知道什么时候有价值的邮件会来，所以要不停的查看。
In psychological terms email is a 'variable-interval reinforcement': we don't know exactly when the good stuff is coming so we have to keep checking.
你会不停的尝试，因为此时的强化是间隔强化，你并不会抱有很高的期望，因此，你的行为通常会持续相当长的一段时间。
Now you keep on trying and because the reinforcement is intermittent you don't expect it as much and so your behavior will persist across often a huge amount of time.
分析了脉冲宽度、脉冲间隔、峰值电流、加工时间对强化层厚度的影响，并对强化层的显微硬度和耐磨性进行了分析。
The effects of pulse width, pulse interval, peak current and process time on intensified layer are analyzed. And the micro-hardness and the property of strengthening layer are also analyzed.
增强扫描，低密度区轻度不均匀强化，而间隔样纤维化、钙化影则不被强化。
After injection of contrast medium, there was slight heterogeneous enhancement in low density areas …
增强扫描，低密度区轻度不均匀强化，而间隔样纤维化、钙化影则不被强化。
After injection of contrast medium, there was slight heterogeneous enhancement in low density areas …
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