它们也能表现为描述一个可定义概念或理论概念的性质，如“一切三角形都有三条边”。
They may also take the form of describing properties of a definable or theoretic concept, such as 'all triangles have three sides'.
本文讨论了三角函数在有理度数上的取值的代数性质，得出其取值均为代数数。
This paper discusses an algebraic property of values of rational degrees of triangle functions. We obtain that they are all algebraic Numbers.
摘要利用由三角级数和幂级数复合构成的函数项级数的有关性质，得到了一类变系数非齐次调和方程边值问题的级数解。
In this paper by using the property of Fourier series a compound series consisting of trigonometric series and power series is established.
并进一步讨论了某些随机三角级数的性质。
And then the properties of some random trigonometric series are discussed.
研究了三角形周长平分弦的性质，得出任一三角形均可确定其最长和最短周长平分弦。
Discuss the properties of the perimeter bisection chord of a triangle, give any triangle, its longest and shortest bisection chords can be determined.
研究结果表明：错位纺纱由于改变了加捻三角形的形状和尺寸，因此成纱结构和性质改变。
It proves that the shape and size of the twisting triangle vary with the dislocation.
三种方法都可以利用直角三角形的性质及代数计算来加以证明。
Three methods can be proved using the feature of a right triangle and algebraic computation.
本文研究了点插值法中以单项式为基函数的形函数的建立及其性质，并通过矩阵三角化算法来克服形函数矩阵大奇异性。
This paper presents the construction of the shape functions using the monomial basic function and describes the properties of the shape functions.
应用数学归纳法验证了“倒三角形”一些性质的存在性，并给出这些性质的证明。
Mathematic induction is used to validate the existence of nature of the Up-side Down Triangle and its testification is given in the paper.
闽南三角地区燕山期花岗岩残积土的工程地质性质是由其物质成分和结构特点决定的。
The engineering geological properties of Yanshanian granitic residual soil in South Fujian are determined by its composition and texture that is dominated by weathered intensity of its mother rock.
闽南三角地区燕山期花岗岩残积土的工程地质性质是由其物质成分和结构特点决定的。
The engineering geological properties of Yanshanian granitic residual soil in South Fujian are determined by its composition and texture that is dominated by weathered intensity of its mother rock.
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