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China launches Earth-observation radar satellites
中国发射对地观测雷达卫星
China launched four Earth-observation radar satellites into space early on Tuesday morning, according to China Aerospace Science and Technology Corp.
据中国航天科技集团公司报道，周二凌晨，中国向太空发射了四颗对地观测雷达卫星。
The State-owned contractor said in a news release that a Long March 2D rocket blasted off at 2:50 am at the Taiyuan Satellite Launch Center in Shanxi province and soon placed the four PIESAT-2 satellites in their preset low-Earth orbit.
这家国有承包商在一份新闻稿中表示，长征二号甲火箭于凌晨2点50分在山西省太原市卫星发射中心发射，很快将四颗PIESAT-2卫星送入预设的近地轨道。
Developed by the Beijing-based private satellite maker GalaxySpace, the satellites are equipped with synthetic aperture radars that can obtain high-resolution images. They also have data processors and autonomous planning systems, according to the company.
这些卫星由总部位于北京的私人卫星制造商银河航天公司开发，配备了可以获得高分辨率图像的合成孔径雷达。据该公司称，他们还拥有数据处理器和自主规划系统。
Duan Xiao, chief designer of the satellites, said that synthetic aperture radar allows for round-the-clock, all-weather monitoring of designated areas on Earth and can play important roles in many public service fields such as land resources management, natural disaster detection and geological mapping.
卫星总设计师段晓表示，合成孔径雷达可以对地球上的指定区域进行全天候监测，并在土地资源管理、自然灾害探测和地质测绘等许多公共服务领域发挥重要作用。
The Long March 2D rocket model, designed and built by the Shanghai Academy of Spaceflight Technology, is propelled by liquid propellants and has a liftoff thrust of 300 metric tons. It is capable of sending a 1.3-ton spacecraft to a typical sun-synchronous orbit with an altitude of 700 kilometers.
长征2D火箭模型由上海航天技术研究院设计和建造，由液体推进剂推进，起飞推力为300公吨。它能够将1.3吨重的航天器发射到700公里高度的典型太阳同步轨道。
The mission was China's 65th space launch this year and the 553rd flight of the Long March family, the nation's main launch vehicle fleet.
这次任务是中国今年的第65次太空发射，也是中国主要运载火箭长征系列的第553次飞行。
Key Words
Launch n.(航天器的)发射；(事件的)发起；(产品的)上市；(船的)下水；
vt.发射；开始从事，发起，发动(尤指有组织的活动)； (首次)上市；
Satellite n.卫星；人造卫星
Blast off 发射；升空；点火起飞
Synthetic adj.（人工）合成的；人造的
n.合成物；合成纤维（织物)
Aperture n.光圈；（尤指摄影机等的光圈）孔径；小孔；缝隙
Autonomous adj.自主的；自治的
Geological adj.地质（学）的
Propellants n.推进剂（如发射用火药）
Sun-synchronous 太阳同步；太阳同步轨道
Orbit n.(天体等运行的）轨道
v.沿轨道运行；围绕...运动
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供稿丨金巾琳
图文编辑丨罗慧怡
初审丨徐秋凤
二审丨 施君颐
终审丨王圣杰
