After more than four decades of research and development, a new type of jet engine is being tested, and it eventually could propel aircraft anywhere in the world within two hours or helping boost cargoes into space at significantly lower costs than current methods permit.
语法 Sentence Correction-1909
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正确的用户笔记
Leating 2014-10-04 14:52:21
this structure is not parallel... it's reasonable to use 'or' in this sentence.
yeying558 2014-07-18 10:44:42
当时误选，没有理解句意，文中强调test发现，中心在test
yeying558 2014-07-18 10:44:43
当时误选，没有理解句意，文中强调test发现，中心在test
不考到730誓不罢休的小星星 2016-09-15 09:53:57
propel和help 不平行
yeying558 2014-07-18 10:44:44
当时误选，没有理解句意，文中强调test发现，中心在test
