他开始觉察到水滴下来的轻柔、微弱的声音。

He became aware of the soft, faint sounds of water dripping.

《柯林斯英汉双解大词典》

就是那个持续的哔哔声，如果它开始变快了或突然停下来了，哪怕是一秒钟，你也能很容易的觉察到。

Just a steady beep - you can quite easily detect if it starts going quicker or if it stops even for a second.

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在项目开始时设置的项目成功的标准看起来可能是很明显并且很容易觉察到，然而遗憾的是，通常情况下它并不是通用的准则。

However obvious and sensible the setting of project success criteria at the beginning of a project may seem, regretfully, it is not currently a common practice.

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