...同源（现象）重新下定义为；“当两个生物的特性（attributes）是来自其共同祖先的相应性状或特征（equivalent characteristics）时，这两者的特性就是同源的。”达尔文本人虽然从来没有如此明确地下过定义，但在他的一些议论中却含蓄地表明了这一点。
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To in this paper, the definition of complex generalized positive definite matrix is given, its fundamental properties are studied, and its equivalent characteristics are established.
当引入广义正定复矩阵这个概念之后，也应该讨论它相应的性质与结构，这对丰富矩阵论的内容无疑是有意义的。
The main features of currency are its financial and circulatory characteristics on the basis of being a universal equivalent.
货币最主要的特性是在一般等价物的基础之上，所拥有的金融性和流通性。
Butterfly valves have flow characteristics three times better than globe valves and approximately 75% of an equivalent size gate valve.
蝶阀的流体特性相当于截止阀的三倍甚至更高，相当于同样尺寸的闸阀的75%。
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