Variable

(noun.) a quantity that can assume any of a set of values.

(noun.) a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.

(noun.) something that is likely to vary; something that is subject to variation; 'the weather is one variable to be considered'.

(adj.) (used of a device) designed so that a property (as e.g. light) can be varied; 'a variable capacitor'; 'variable filters in front of the mercury xenon lights' .

(adj.) liable to or capable of change; 'rainfall in the tropics is notoriously variable'; 'variable winds'; 'variable expenses' .

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• The difficulty in distinguishing variable species is largely due to the varieties mocking, as it were, other species of the same genus. 查尔斯·达尔文. 物种起源.
• Its great interest for the history of thought lies in the fact that it is the result of seeking the constant in the variable, the unitary principle in the multiple phenomena of nature. 李贝. 西洋科学史.
• Rudimentary parts, as is generally admitted, are apt to be highly variable. 查尔斯·达尔文. 物种起源.
• A brake was provided for in the specification, as were also variable gears for changing speed, and an automatic blower for the fire. Edward W. Byrn. 十九世纪发明进展.
• The impression is made by an oscillating type wheel, to which a variable throw is imparted by the key letters to bring any desired letter into printing position. Edward W. Byrn. 十九世纪发明进展.
• What a form she had, what a face she had, what a graceful, variable, enchanting manner! 查尔斯·狄更斯. 大卫·科波菲尔.
• The first or variable forms vary much within the limits of the same island. 查尔斯·达尔文. 物种起源.
• Rudimentary organs, from being useless, are not regulated by natural selection, and hence are variable. 查尔斯·达尔文. 物种起源.
• Secondary sexual characters are highly variable, and such characters differ much in the species of the same group. 查尔斯·达尔文. 物种起源.
• Villette owns a climate as variable, though not so humid, as that of any English town. 夏洛蒂·勃朗特. 维莱特.
• But as this sympathy is very variable, it may be thought that our sentiments of morals must admit of all the same variations. 戴维·休谟. 人性论.
• Its principle depends upon the variable resistance of carbon in accordance with the degree of pressure to which it is subjected. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• If, then, these two varieties be variable, the most divergent of their variations will generally be preserved during the next thousand generations. 查尔斯·达尔文. 物种起源.
• Method of obtaining a variable movement of a miniature target, corresponding to rolls of a vessel of from 1 to 10 degrees. 佚名. 神奇的知识之书.
• A slight and variable colour tinged her cheeks, and her motions seemed attuned by some hidden harmony of surpassing sweetness. 玛丽·雪莱. 最后一个人.

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