Each piglet may be small enough to fit in the palm of a hand, 每一只小猪都小得可以放在手掌心上

214. The female is busy collecting grass,
     这只母猪正忙着把草收集起来
215. but not for eating.
     不过这不是为了填饱肚子
216. She's building a nest.
     而是为了筑巢
217. Each piglet may be small enough to fit in the palm of a hand,
     每一只小猪都小得可以放在手掌心上
218. but she does have 10.
     但母猪确生了有10只小猪
219. This is how grass can grow, given unlimited sunshine and water.
     这里让我们见识到了如果有足够的阳光和雨水 草能够长到什么程度
220. But on most tropical plains across our planet, the wet season is followed by a dry one.
     然而地球上的绝大多数热带草原 在经历雨季后总是要经历旱季的

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 217 行