龟苓膏

今天在查美标的电源插头时，学到了一个很好玩的知识[1]。

In electrical and mechanical trades and manufacturing, each of a pair of mating connectors or fasteners is conventionally assigned the designation male or female. The assignment is by direct analogy with genitalia and sexual intercourse; the part bearing one or more protrusions, or which fits inside the other, being designated male and the part containing the corresponding indentations or fitting outside the other being female.

意译：

在电气和机械的贸易及生产中，互相配对的连接器和固定器通常会被分配命名为“男性”或是“女性”。这种分配方式是通过类比外生殖器以及性行为而来的。拥有一个或多个突起物或在内部连接到另一方的被命名为男性；而拥有对应的接口或是在外部连接另一方的被命名为女性。

不得不再次感叹一下英文的丰富多彩。

FOOTNOTES
1. 英文原文来自：http://en.wikipedia.org/wiki/Gender_of_connectors_and_fasteners↑