1818年菲涅耳参加了法国科学院主办的一次竞赛.In 1818 Fresnel entered a competition sponsored by French Academy.菲涅耳通过加进来干涉概念,解决了这个困难.The difficulty was resolved by Fresnel with his addition of the concept of interference.在许多情况下, 对于我们的目的来说,更简单...
The doctor, in his fifties, graying and distinguished, was a solid performer.那位医生, 五十来岁, 头发花白,仪态端庄, 是位老练的表演者.The doctor was in his fifties, graying and distinguished.那位医生,五十来岁, 头发花白,仪表端庄.Several studies suggest smoking c...
There were also several accidents mainly caused by engine failures on take-off.还有几次事故主要是起飞时引擎出现故障造成的。Many motor accidents are the result of unthinkingly mixing speed and alcohol.许多机动车事故都是不计后果地酒后开快车造成的。With a little foret...