racer（n.）
"赛跑者或赛跑物"，1640年代指人，1660年代指马，1793年指车辆，1809年美国英语中指一种蛇； 代理人名词来自 race（v.）。
WHEN a lad, I lived with my father in the then province of New Jersey, where the black snake, with a white throat, commonly called the racer, as well as the rattle snake, and other serpents, are frequently met with ; and I never remember to have heard any one dispute the power of charming belonging to several species of serpents, but more common to the black snake, called the racer, which I have twice seen in the operation. ["Extract from a letter from Samuel Beach, dated Whiting, July 24, 1795," in appendix to Samuel Williams, "The Natural and Civil History of Vermont," 2nd ed., 1809]
小时候，我和父亲住在当时的新泽西省，那里经常可以看到黑蛇，有白喉咙，通常被称为赛跑者，以及响尾蛇和其他蛇类； 我从未听说过有人质疑几种蛇类拥有魅惑力的能力，但更常见于黑蛇，称为赛跑者，我曾两次见到它在操作中。["Samuel Beach 的一封信摘自1795年7月24日的 Whiting，附在 Samuel Williams 的《佛蒙特州的自然和文明史》第二版中，1809年]
该词起源时间：1640年代