See through head mounted display ( HMD ) is a key component in the augmented reality ( AR ) system.

穿透式双通道头盔显示器 ( HMD ) 是增强现实系统中的关键部件.

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A series of Copolyimides, derived from hexamethylene diamine ( HMD ) , 4,4? ? - diaminodiphenyl ether ( ODA ) and 3,3? ?, 4,4? ? - oxydiphthalic dianhydride ( ODPA ), were prepared.

采用二苯醚3,3, ′4, 4′-四 甲酸 二酐与己二胺和4, 4′-二氨基二苯醚为 单体 合成聚酰胺酸, 经热酰亚胺化制备共聚型聚酰亚胺.

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Objective To study the sickness rate and risk factors of bronchopulmonary dysplasia ( BPD ).

目的　研究肺透明膜病(HMD) 患儿支气管肺发育不良 ( BPD ) 的患病率、高危因素.

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Results 18 neonates had BPD ( 24 3 % ).

结果　74例HMD中 有18例 BPD,患病率为24-3%.

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The HMD eliminates the cost and weight associated with traditional head - up displays and simplifies cockpit design.

头盔内嵌显示器消除了与传统抬头显示器相关的花费和重量,并简化了座舱设计.

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