Individually the algae are tiny but together, they produce three quarters of all the oxygen in our atmosphere. 单体藻类虽然很细小 但它们共同产生了我们大气中四分之三的氧气
but these coral havens contain one quarter of all the marine life on our planet. 不过珊瑚礁汇聚着地球上四分之一的海洋生物
Our planet's continents are fringed by shallow seas. 我们陆地的边缘都是浅海域
They tell any neighboring siamangs this is our territory. Keep out. 他们在告诉其他的合趾猴邻居 这是我们的领地,非请勿进!
New Guinea lies in a warm tropical belt that girdles our planet around the equator. 新几内亚岛地处热带,赤道从岛中穿过
This is our planet's hothouse. The jungle. 这是我们地球上的温室-丛林
The elephant's night vision is little better than our own. 大象的夜视能力只比人类稍好一点
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
are home to some of the largest grass-eating mammals on our planet. 草原上生活着世界上最大的
This rich pasture once supported the greatest herds ever seen on our planet. 这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落