Once upon a time, plants relied solely on wind or water to spread their pollen... 过去植物仅依靠风或水来传播花粉
they can never let down their guard... 也绝不能放松戒备
Their stomachs can digest the tough conifer needles... 它们的胃可以消化坚硬的针叶
into adults that are 50 times their size. 成为体重是自己50倍的成年动物
Their legs extend beneath their body rather than to the side 它们的腿长在身体下方而非侧面
allowing them to run without having to stop to catch their breath. 使其在奔跑时无需停下来呼吸