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...
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...
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...