英语听力：自然百科 大堡礁：珊瑚礁到雨林—26

 These huge tracks of rainforest close to the Queensland coast are essential because they regulate the flow of water and the sediment¹ it contains. That’s important, because there’s an awful lot of water here. 

 

Hot humid tropical air gives rise to vast amounts of rainfall. It pours for at least 120 days a year. And as much as 60 centimeters can fall in a single day. It’s one of the wettest places on earth. Left unchecked by the forest, the water would wash out sediments² and smother³ marine⁴ life. But waterways flowing off the rainforest are relatively⁵ clear, and many are spectacular.

1 sediment   

n.沉淀，沉渣，沉积(物)

参考例句：

• The sediment settled and the water was clear.杂质沉淀后，水变清了。
• Sediment begins to choke the channel's opening.沉积物开始淤塞河道口。

2 sediments   

沉淀物( sediment的名词复数 )； 沉积物

参考例句：

• When deposited, 70-80% of the volume of muddy sediments may be water. 泥质沉积物沉积后，体积的70-80％是水。
• Oligocene erosion had truncated the sediments draped over the dome. 覆盖于穹丘上的沉积岩为渐新世侵蚀所截削。

3 smother   

vt./vi.使窒息；抑制；闷死；n.浓烟；窒息

参考例句：

• They tried to smother the flames with a damp blanket.他们试图用一条湿毯子去灭火。
• We tried to smother our laughter.我们强忍住笑。

4 marine   

adj.海的；海生的；航海的；海事的；n.水兵

参考例句：

• Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
• When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。

5 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。