英语听力：自然百科 海洋天堂大堡礁:堡礁内外—15

But that pales into insignificance¹, when compared to the daily vertical² migration³ of these mircoscopic animals called zooplankton. At sunset, all of these tiny creatures swin upwards⁵, and under cover of darkness, they grease on floating algae⁶ close to the surface.Many of them are fish lave. In fact, almost every fish species on the Great Barrier Reef starts life in the plankton⁴. They are billions upon billions of them making the round trip, the greatest daily migration on earth. They all travel an extraordinary distance. Size for size, it would be like me running America twice a day. That's if they are not caught on the way up. On the reef wall at about 150 meters deep, a huge sea fans. They look like plants, but they are colonialism animal, whose branching arms capture the rising plankton. Hidden among the branches is the p* seahorse. It's a tiny fish that also feeds on plankton. At a little more than a centimetre long fully⁷ grown, it's one of the world's smallest fish. 

1 insignificance   

n.不重要；无价值；无意义

参考例句：

• Her insignificance in the presence of so much magnificence faintly affected her. "她想象着他所描绘的一切，心里不禁有些刺痛。 来自英汉文学 - 嘉莉妹妹
• It was above the common mass, above idleness, above want, above insignificance. 这里没有平凡，没有懒散，没有贫困，也没有低微。 来自英汉文学 - 嘉莉妹妹

2 vertical   

adj.垂直的，顶点的，纵向的；n.垂直物，垂直的位置

参考例句：

• The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
• Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。

3 migration   

n.迁移，移居，（鸟类等的）迁徙

参考例句：

• Swallows begin their migration south in autumn.燕子在秋季开始向南方迁移。
• He described the vernal migration of birds in detail.他详细地描述了鸟的春季移居。

4 plankton   

n.浮游生物

参考例句：

• Plankton is at the bottom of the marine food chain.浮游生物处于海洋食物链的最底层。
• The plankton in the sea feeds many kinds of animals. 海的浮游生物成为很多种动物的食物。

5 upwards   

adv.向上，在更高处...以上

参考例句：

• The trend of prices is still upwards.物价的趋向是仍在上涨。
• The smoke rose straight upwards.烟一直向上升。

6 algae   

n.水藻，海藻

参考例句：

• Most algae live in water.多数藻类生长在水中。
• Algae grow and spread quickly in the lake.湖中水藻滋蔓。

7 fully   

adv.完全地，全部地，彻底地；充分地

参考例句：

• The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
• They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。