A soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals.
2
镁及其合金密度小，仅为铝的64％，钢的25％，是目前密度最轻的金属结构材料之一。
The density of magnesium and its alloys is yelatively low, only accounts for 64% of aluminum density and 25% of steel density, and it is one of the lightest structural metallic materials.
3
研究人员研发出人类已知最轻的金属，这种材料比泡沫聚苯乙烯还轻100倍，轻到可以放在蒲公英头上。
Researchers have developed the lightest material known to man, about 100 times lighter than styrofoam, and clearly light enough to perch on the head of a dandelion.
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