Conditions are good in school. It's inexcusable not to study hard.学校环境好, 不用功念书可说不过去.I fear lest we commit an inexcusable blunder.我为我们会犯不可原谅的错误而担忧.He said the killing of innocent people was inexcusable.他说滥杀无辜是不可原谅的。T...
天文学家们过去一直感到奇怪,为什么只有土星有光环.Astronomers used to ask why only Saturn has rings.“土星族”飞行器可以分为三类或三组.The Saturn family of launch vehicles falls into three types or groups.数值例子大多数取自“土星V”飞行器的研究.Numerical examples are mostly taken ...