he said he was lucky the airport had a back-up system of its own generators -- otherwise he would have to try to land in total darkness.
他说,幸运的是,机场自己有后备的发电设备。否则,他得设法在黑暗里降落。
but the astronauts switched on the back-up system and were able to continue the mission for another three days and land safely at edwards air force base.
宇航员于是开动了后备的空调设备,这样他们才能再持续工作三天,然后安全地在爱德华兹空军基地降落。
favourable social and technical environment and social back-up system are the social basis for the normal development of productive forces of modern society.
良好的社会技术环境和社会支持体系,是现代生产力正常发展的社会基础。
but the astronauts switched on the back-up system and were able to continue the mission for another three days and land safely at edwards air force base.
宇航员于是开动了后备的空调设备,才能再持续工作三天,然后安全地在爱德华兹空军基地降落。
blackberry users cursed their devices, which stopped working because of problems at servers for which a back-up system failed to work.
黑莓用户最近对其运营商骂声不断,这主要是因为手机服务器的备份系统不工作而使手机无法正常工作。
he said he was lucky the airport had a back-up system of its own generators -- otherwise he would have to try to land in total darkness.
it firstly analyzes the state of tbss, then discusses the expected goal of concentrating back-up system and how to construct concentrating back-up platform of tbss.