他们慢慢地从舞台后方的左侧移至正中。They slowly moved from upstage left into the centre.为安全起见，千万别站在马的正后方。For safety'ssake, never stand directly behind a horse.她总是坐在司机驾驶位置的正后方。She always sits immediately behind the driver....
abscissa of absolute convergence绝对收敛的横坐标Convergence and divergence of infinite series depend upon this concept.无穷级数的收敛性与发散性与此概念有关.There is a convergence between capitalist firms and co-operatives in terms of business str...