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On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box.. 他在一根垂直的針頭頂點(diǎn)，設(shè)置了一根水平的鋼制細(xì)棍，它可以左右轉(zhuǎn)動(dòng)，就像羅磐裡的磁針那樣。