bar magnetic compass
常见例句
- 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，設置了一根水平的鋼制細棍，它可以左右轉動，就像羅磐裡的磁針那樣。 返回 bar magnetic compass