1、Obstacle-free sector is a sector formed by an arc originating at the reference point of the edge of a helideck and extending outward in the horizontal plane level with the elevation of the helideck.───无障碍区域是由一个起于直升机甲板边缘的基准点并在直升机甲板的水平面向外延伸的弧形所形成的区域。
2、Helideck and obstruction lights shall be provided to enable helicopter pilot to identify and use the area by day and night.───甲板灯及障碍灯应始终保持工作状态以确保飞机驾驶员确认及使用。
helideck（意思翻译）
n.直升机甲板
helideck（相似词语短语）
1、what s shelike───谢尔克是什么人
2、crura of antihelix───对耳轮脚
3、epithelial membrane───上皮膜
4、cuboidal epithelium───立方上皮细胞；[组织]立方上皮
5、endothelium of blood vessels───血管内皮
6、chorded helium───弦氦
7、chelidonium 6x───白屈菜碱6x
8、helicopter cap───直升机顶盖
9、nephelite syenite───霞石正长岩
10、chelidon greek───希腊语chelidon
helideck（双语使用场景）
1、Obstacle-free sector is a sector formed by an arc originating at the reference point of the edge of a helideck and extending outward in the horizontal plane level with the elevation of the helideck.───无障碍区域是由一个起于直升机甲板边缘的基准点并在直升机甲板的水平面向外延伸的弧形所形成的区域。
2、Helideck and obstruction lights shall be provided to enable helicopter pilot to identify and use the area by day and night.───甲板灯及障碍灯应始终保持工作状态以确保飞机驾驶员确认及使用。