adapt; break in; run in; grind in 传统大国和新兴大国应当相互~。The traditional powers and emerging powers should adapt themselves to each other./它们处于相互~期。They are in a period of mutual adaptation./处在~阶段in a fine-tuning period;in a run-in period; in a period of adjustment/总统与新闻媒体的首次~ the President’s first run-in with the media/~期break-in period