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 magnesium  
[mæg'ni:zjәm]
n.
[化]镁

  1. A glass bulb filled with finely shredded aluminum or magnesium foil that is ignited by electricity to produce a short-duration high-intensity light flash for taking photographs.
    闪光泡一种内部装有铝箔或镁箔的精细碎片的玻璃灯泡,用电点燃以发出短暂的高强度闪光,从而拍摄照片