The normal no-traffic line condition in which a steadyspace is transmitted ; it may be a customer selectable option.
正常的空闲线路状态，在这种状态下，传输的是稳定的空号信号，是用户可以选择的一种线路状态。
2
Qinhuangdao stadium roof system is composed of 24 cantilever trusses. The truss, arc beams and cables form together a steadyspace system.
秦皇岛体育场屋盖由24榀悬臂桁架组成，桁架之间以弧形拱梁和钢索连接为空间稳定体系。
3
And besides, in the 54-year history of the space age, no one has ever been hit by falling debris, despite a steady rain of satellites and rocket bodies.