1. Thin（常用词） 词义：物理变薄或数量减少 用法：既可作动词也可作形容词 例：She thinned the paint with water.（她用水稀释颜料） 特点：最通用，可指具体或抽象变薄
2. Attenuate（专业术语） 词义：通过外力使物质变薄或信号减弱 用法：多用于科技语境 例：The fiber optic cable attenuates the signal over long distances.（光纤长距离传输会使信号衰减） 特点：强调逐渐减弱过程，常用于物理/工程领域
3. Extenuate（特殊用法） 词义：减轻过错/罪责的严重性 用法：仅用于抽象概念 例：His youth may extenuate but not excuse the crime.（他的年轻可以减轻但不能免除罪责） 特点：具有法律/道德层面的特殊含义
4. Dilute（化学用语） ...(以上内容有节略,please sign in for more)500
【Thin】 is the most inclusive of these terms and is interchangeable with any of the others, though not without some loss of precision or of specific connotations. Basically it implies reduction in thickness or in density; in extended use it implies a comparable diminution (as of strength, depth, or intensity).
【Attenuate】 implies thinning as the result of some such process as drawing out, spinning fine, or culturing (as a strain of bacteria) repeatedly or as the effect of conditions (as disease or starvation) which emaciate.
In its frequent extended use 【attenuate】 implies the loss of properties that are necessary to a thing's strength, richness, effectiveness, or vitality, and it often connotes overrefining, oversubtilizing, or overemphasis of an opposing quality.
【Extenuate】 in a somewhat learned use can suggest attrition either by literally emaciating and exhausting (see also PALLIATE ) or by a gradual diminishing of a thing's importance or significance.
【Dilute】 implies a thinning of what is concentrated by the addition or, in extended use, sometimes by the influence of something that weakens it, neutralizes it, or destroys its vigor or intensity.
【Rarefy】 implies a thinning in density and usually an expansion in volume or a decrease in weight or pressure. The word occurs in extended use chiefly with reference to ideas, emotions, and intellectual powers, sometimes suggesting their spiritualization or refinement and the elimination of all grossness and impurity and sometimes imputing to them a vaporous or tenuous quality.
