China has 123,000 km of navigable waterways, of which 61,000 km are officially classified for commercialnavigation purposes.
中国约有12.3万公里可通航的河道，其中6.1万公里为商业运输航道。
2
Commercial satellites provide businesses with everything from data and video transmissions to support for automated bank teller systems and consumer navigation devices.
商业卫星为企业用户提供从数据和视频传输到银行自动柜员机系统和消费者导航设备支持等各种服务。
3
Commercial USES for mathematical workstations are vast: from basic engineering to designer drugs and from gene therapy to celestial navigation, mathematics rules the world.