Construct an animation of the deltoid sliding on two mutually perpendicular lines.建构一动态绘图:展示三角线沿著互相垂直的两轴滚动.Construct two mutually orthogonal tangents of the deltoid. Where do they meet?三角星形线的两条互相垂直的法线的交点在哪里?Construct rot...
He could not believe that, had the Englishman known how much he was at risk, he would have hazarded his grandson.他无法相信，如果当时那个英国人知道他冒的风险有多大，他还会让自己的孙子去冒这个险。Personal reputations were to be hazarded in the issue.个人的名誉将在这场斗争里...
白垩纪尚无壳斗科可靠的大化石记录,微化石需要进一步研究才能确定亲缘关系以及古新世壳斗科已经分化出两个类群.No creditable macrofossil record of the Fagaceae exists in the Cretaceous equivocal and require further study....
The road follows the natural contours of the coastline.这条路沿着海岸线的自然轮廓延伸。I cradled my video camera nervously on my lap, but its cold contours did nothing to comfort me.我紧张地把摄影机架在大腿上，但是它冰冷的外形并没能给我任何安慰。He walked among the di...