The problem is exacerbated by the lack of an adequate replacement for a pair of Earth-observation satellites, the Orbiting Carbon Observatory and Glory, which failed on launch in the past two years.
在过去两年Glory观测卫星失败发射，所以无法提供备用的地球观测卫星，这进一步加重了该问题。
The necessity and possibility of replacement of noble metals by rare earth elements in the automobile exhaust catalyst control technology were elucidated.
阐述了汽车尾气催化净化工艺中用稀土代替贵金属的必要性和可能性。
Authors propose that the partial or whole replacement of noble metals by rare earth elements is an important direction in the future developments of emission control three way catalysts.
采用稀土元素部分或全部取代贵金属是研制开发三效汽车排气净化催化剂的重要方向。
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