航区是指运载火箭和导弹等飞行器飞行弹道经过的“走廊”形区域，即从发射场区到弹着区或入轨点之间的弹道沿线区域。导弹航区与发射场区和弹着区一起组成导弹试验靶场。航区两侧设置有各种测控和通信台站，对陆上测控设各难以覆盖的飞行段，则设置有测量船和测量飞机。用以对飞行中的火箭和导弹进行跟踪，测量和监控。
... sailing raft 帆筏 sailing region 航区 Sailing Rights in Inland Water 内水航行权 ...
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禁航区 [航] [水运] prohibited area ; No-Fly Zone ; forbidden zone ; prohibited
限航区 airspace restricted area ; area
引航区 Pilotage Area ; pilot waters ; piloting district
禁航区域 prohibited area
机场飞航区域 airport traffic area
有限航区航运 Limited Service ; restricted service
易航区 easy area
可航区 easy area
航区限制 Trading Limits
超过核定航区航行；未按规定的航路行驶；
Navigating beyond the ratified navigation areas; Not navigating in the prescribed sea route;
第十五条除经主管机关特别许可外，禁止船舶进入或穿越禁航区。
Article 15 Vessels shall be prohibited from entering or passing through restricted navigation zones unless specially permitted by the competent authority.
该船是专为注册适合作为货运驳船，并根据最新的规则和规例的BV无限制航区。
The vessel is designed suitable for registration as a cargo barge and constructed in accordance with the latest rules and regulations of BV for unrestricted services.
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