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...
" You've never been a sharp shopper.柔嘉道: “ 你这人从来不会买东西.Hong Kong is a shopper's paradise.香港是购物者的天堂.Even the emerging shopper is beginning to pull his weight.就连新兴消费者也开始发挥出自己的力量....
They raised $630,000 through listener donations, and then called it quits.他们通过听众捐款的方式筹集了63万美元后宣告结束。Dr Brian was a good listener.布莱恩医生会耐心倾听他人说话。I felt it politic to keep my peace and play the part of the attentive listene...