globally by satellite and submarine cable, providing speedy and reliable communications throughout the world Version 建立全国统一的大容量的通讯网络,由计算机进行控制,通过卫星和海底电 缆在全球范围内提供快速可靠的通讯服务,从技术上来讲是完全可能的。 4)The advent of jet and rocket propulsion, and of nuclear reactors has shown that the materials which previously served for constructional purposes are no longer wholly satisfactory for the manufacture of equipment on which the efficient functioning of these new sources of power depends Version 喷气式飞机、火箭助推器以及核反应堆的出现表明,用过去的建材来建造那 些有效使用新能源的设备已不可能再取得令人完全满意的效果 (5 It is in emergency also, that the station master may be called on to make decisions of considerable importance in regard to the working of the trains past his station, though in general operation control systems are now so extensive more particularly on main lines, that he can obtain without any great delay a decision by telephone from the control office of the area in which his station is situated as to any altered methods of working that it may be necessary to put in force Version 尽管一般来说,运行控制系统目前已经广泛应用(特别是在主干线上),站长7 globally by satellite and submarine cable, providing speedy and reliable communications throughoutthe world. Version: 建立全国统一的大容量的通讯网络，由计算机进行控制，通过卫星和海底电 缆在全球范围内提供快速可靠的通讯服务，从技术上来讲是完全可能的。 (4)The advent of jet and rocket propulsion, and of nuclear reactors, has shown that the materials which previously served for constructional purposes are no longer wholly satisfactory for the manufacture of equipment on which the efficient functioning of these new sources of power depends. Version: 喷气式飞机、火箭助推器以及核反应堆的出现表明，用过去的建材来建造那 些有效使用新能源的设备已不可能再取得令人完全满意的效果。 (5)It is in emergency, also, that the station master may be called on to make decisions of considerable importance in regard to the working of the trains past his station, though in general operation control systems are now so extensive, more particularly on main lines, that he can obtain without any great delay a decision by telephone from the control office of the area in which his station is situated as to any altered methods of working that it may be necessary to put in force. Version: 尽管一般来说，运行控制系统目前已经广泛应用（特别是在主干线上），站长