During a war, a leader must be single-minded and, if necessary, ruthless.战争期间，领导人必须意志坚定，必要时还得心狠手辣。Jensen's experience in prison left him hard-bitten, cynical, and ruthless.詹森在狱中的经历令他变得冷漠无情、愤世嫉俗、心狠手辣。He's a terrible screw at a bargain.他在讨价还价上是个心狠手辣的老手。