她一直看着锅炉上的刻度盘，指针已经到达250度。
She kept looking at the dial on the boiler. The needle had reached 250 degrees.
指针突然从刻度盘的一端跳到另一端。
这个装置的正面有个刻度盘，盘上至少有三根指针，一根用来指示日期，其余两根用来表示太阳和月亮的位置。
A dial on the front of the device probably carried at least three hands, one indicating the date and the other two indicating the positions of the Sun and the Moon.
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