沙地足迹footprints in the sand猎狗凭着嗅觉顺着狐狸的足迹向前跑去.The hounds ran ahead, following their noses on the trail of the fox.他是个伟大的旅行家,足迹踏遍了全世界.He is a great traveler and has moved about all over the world....
这种点的集合被称为等位面.The set of points is called a level surface.表面本身是一等位面.The surface itself is an equipotential.在等位面与电力线的每个交点, 两者是垂直的.At each crossing of an equipotential and a field line, the two are perpendicular....
The perpetuation of nuclear deployments is morally unacceptable.继续部署核武器在道义上让人无法接受。Her reasons for acting are morally defensible.她的举动从道义上来讲是合情合理的。Such power is politically dangerous and morally objectionable.这样的权力在政治上极其危险...