尘世是常变的泡沫漂浮在一海的沉默之水面上。

The world is the ever-changing foam that floats on the surface of a sea of silence.

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对于模型未知的复杂非线性系统或是动态特性常变的控制对象，两者的不依赖精确数学模型的控制特性具有无可比拟的优势。

They have superiority in the uncertain model and non-linear system and time variant system control, due mostly to their being independent of precise mathematical model.

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她说，就老年人而言，这种脑损伤象征着血流量的减少，且常出现于变痴呆的人脑部，包括患阿尔茨海默氏症的人。

In the elderly, she says, such brain lesions tend to denote reduced blood flow and often show up in people who are developing dementias, including Alzheimer's disease.

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