she, too, survives on a diet of tasty termites. 它也以美味的白蚁为食
these small creatures were limited to a life in the margins. 这些小生物局限在边缘生活
They've evolved a separate caste of armed soldiers who protect the workers. 它们进化出了 一个武装士兵群体来保护工蚁
Like a well-drilled Roman legion... 就像一个训练有素的罗马军团
in a remarkable evolutionary arms race. 这是一场精彩的进化军备竞赛