On January 24, 1848, Marshall noticed glints of gold in the water flowing through the mill's tail race.
1848 年 1 月 24 日,马歇尔注意到流经磨机尾流的水中闪烁着金色的。
英语百科
Mill race
A mill race, millrace or millrun is the current of water that turns a water wheel, or the channel (sluice) conducting water to or from a water wheel. Compared to the broad waters of a mill pond, the narrow current is swift and powerful. The race leading to the water wheel on a wide stream or mill pond is called the head race (or headrace), and the race leading away from the wheel is called the tail race (or tailrace).