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Source: Computational Materials Science, Volume 267，详情可参考91视频
The US space agency has released a "pre-solicitation" for what is expected to be a hotly contested contract to develop a spacecraft to orbit Mars and relay communications from the red planet back to Earth.，这一点在WPS下载最新地址中也有详细论述
Юрий Леонов (ведущий редактор отдела «Бывший СССР»)