The HALS system provided the UH-60 pilots with continuous 3d real-time radar imagery of the landing zone throughout the approach, hover, and landing in complete brownout.
在灯火管制情况下，在整个接近、盘旋和着陆过程中，HALS系统可以向UH - 60飞行员提供着陆区的连续三维实时雷达图像。
Reporting by Tom Hals in Wilmington, Delaware and Roberta Rampton in Washington; Editing by Dale Hudson and Eric Walsh.
本新闻由特拉华州威明顿市的汤姆·哈尔斯和华盛顿的罗伯塔·兰普顿报道；由戴尔。哈德逊和埃里克·沃尔什编辑。
AIM: to explore the clinical feasibility and superiority of hand-assisted laparoscopic surgery (HALS) technique through lap disc hand-assisted device and to extend the application range of HALS.
目的：探讨经蓝碟手辅助腹腔镜下外科技术在腹部外科疾病诊断、手术切除上的可行性和优越性，扩大经蓝碟手辅助腹腔镜下外科技术的适用范围。
HALS light stabilizer action and principle, together with conventional HALS structure and property in paint and coatings industry are briefly introduced.
简介了位阻胺光稳定剂(HALS)的作用原理及涂料工业中常用HALS的结构及性能。
The effects of hindered amine light stabilizers (HALS), antioxidants on the radiation induced discoloration of polypropylene (PP) and polyethylene (PE) are studied.
结果表明五甲基HALS比相应的四甲基HALS更能有效地阻止聚烯烃的辐射致色。
HALS are experimentally used in PVC films in this study. It is shown that thermostabilization and photostabilization functions of HALS are similar to those of benzophenone in PVC.
将受阻胺光稳定剂试用于PVC薄膜，结果表明，该光稳定剂用于PVC中，其光、热稳定效果与二苯甲酮类紫外光稳定剂相近。
HALS are experimentally used in PVC films in this study. It is shown that thermostabilization and photostabilization functions of HALS are similar to those of benzophenone in PVC.
将受阻胺光稳定剂试用于PVC薄膜，结果表明，该光稳定剂用于PVC中，其光、热稳定效果与二苯甲酮类紫外光稳定剂相近。
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