但仍有理由相信，至少在本世纪上半叶，美国将仍然拥有实力源的主导地位，并继续在全球实力平衡中扮演核心角色。
But there is still reason to believe that, at least in the first half of this century, the US will retain its primacy in power resources and continue to play the central role in the global balance of power.