M
magnificence
n.华丽, 富丽堂皇 the quality or state of being magnificent 

mandatory
adj. 命令的, 强制的 Required or commanded by authority; obligatory 

mar
v.弄坏, 毁坏 to inflict serious bodily harm on : DESTROY 

mature
adj.成熟的, 到期的 having completed natural growth and development : RIPE 

merchandise
n.商品, 货物 the commodities or goods that are bought and sold in business : WARES 

minuscule 
adj.小字写的written in or in the size or style of minuscules, 极小的 very small 

moderately
adv.适度地 avoiding extremes of behavior or expression: CALM, TEMPERATE 

motionless
adj.不动的, 静止的 without any motion 

muscular
adj.肌肉的 of, relating to, or constituting muscle; 强健的 having well-developed musculature 

mutation
n.变化, 转变 a significant and basic alteration : CHANGE