“精锐的”的英语？

两个精锐的师在边境上, 准备出击.Two crack divisions are on the border, ready to jump off.她们真是我未见过这麽精锐的娘子军团.They were the sharpest group of gals I'd ever met.海军陆战队是精锐的快速反应部队.The Marine Corps is a crack rapid reaction force....