精密仪器用来帮助飞行员操作飞机. 《简明英汉词典》. The smaller of its hands occasionally slipped round on the pivot, and thus, though the minutes were told with precision, nobody could be quite certain of the hour they belonged to. 表上的时针在轴上滑动, 这样, 虽然分钟仍很准确, 但是点钟就没有人 ... More @Wikipedia
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