口语材料：
The lower mandible of their beaks is greatly elongated.
They slice it through the surface of the water at ten metres a second.
If and when it hits a tiny fish, it'll snap shut.
But why come up river to these open sand flats?
This is the answer.
But this nursery will not exist for long.
Four weeks from now, it'll be under ten metres of water.
If by then these chicks can't fly,
they will drown.
The problem for young skimmers is
that when they hatch,
the lower part of their beaks is the same size as the upper.
While they wait for it to grow,
they do their best to learn the skimming technique.
参考译文：
他们的下喙长得非常长
他们能以每秒十米的速度划过水面
当下喙碰到小鱼时会立刻合上
但为何要逆流而上到这片开阔的沙滩来呢
这就是答案
但这个托儿所无法长期存在
再过4周这里会被十米深的河水淹没
若到那时幼鸥仍不会飞就会被淹死
幼小的剪嘴鸥在破壳而出时
他们的下喙跟上喙一样长
等待下喙长长的同时
他们会努力学习捕食技巧
点单词 关闭全部解释
知识讲解：
But why come up river to these open sand flats?
但为何要逆流而上到这片开阔的沙滩来呢？
come up 升起；靠近，走进
His new book did not come up to expectation.
他的新作没有达到预期水平。
You've come up in the world, haven't you?
你的地位已经上升了，是吗？
But this nursery will not exist for long
但这个托儿所无法长期存在
exist有时有“在逆境中生活，仅能活命”的意思。
Some people in some poor countries receive wages that allow them to exist but not to live.
有些贫困国家的人民的收入只能勉强维持生计。
exist与subsist区别：subsist指“继续存在”，而exist指“存在”。
While they wait for it to grow,they do their best to learn the skimming technique.
等待下喙长长的同时他们会努力学习捕食技巧。
wait for 等候；等待
It irks us to wait for people who are late.
等候迟到的人使我们厌烦。
He was then sitting on thorns and waiting for you.
他当时如坐针毡，焦急地等待着你。
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