But they, too, were becoming increasingly sophisticated, social, 但它们也变得越来越复杂 有社会性
Living in a group has other advantages too, 一起生活还有其它优势
she's too small to live among the herd where she might be trampled. 个子太小 无法在龙群中生活 否则可能被踩到
dragonflies in flight can be just too hard to catch. 飞行中的蜻蜓仍然很难捕获
Arthropods, like this spider crab, live here too... 这里还有节肢动物 比如这只蜘蛛蟹
she strays too close to the next. 它却又太靠近了另一个挑衅者