Normally a point in space is identified by means of coordinates.空间中的点通常是依靠座标来定位的.We carry out a transformation to spherical polar coordinates.我们变换成球极坐标.For a system, Hamiltonian is invariant under any translation of spat...
He has invented innumerable excuses, told endless lies.他编造了数不清的借口和谎话。He kept waffling and finding excuses not to close the deal.他一直举棋不定，找出种种理由不予成交。It's easer for people to make excuses so we don't have to chang...
He left a host of other riders trailing in his slipstream.他把其他的摩托车手甩在身后。Over 1000 riders cycled 100 miles around the Vale of York.有1,000多人围着约克谷地骑行了100英里。A group of riders came into view on the dirt road.一群骑车的人出现在那条土路上。So...
As the dusk shaded into night, we drove slowly through narrow alleys.夜幕渐渐降临，我们驱车在狭窄的胡同里缓慢前行。Drug addicts shoot up in the back alleys.瘾君子们在后街小巷里注射毒品。I followed him through a maze of narrow alleys.我紧随他穿过一条条迂迴曲折的窄巷....