to rival the long-lost dinosaurs. 能够与消失已久的恐龙相媲美
Competition between these rival species 这些对手物种之间的竞争
..a rival male drops by, to size up the competition... 一只竞争对手来到此处 评估一下彼此的优劣
It's an uncertain time. The size of the rival group is as yet unknown. 在这个非常时刻 对手的具体数量还不知道