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旁白：请听生物课上的部分内容。

Narrator: Listen to part of a lecture in a biology class.

教授：鸟类在动物王国拥有一些最好的视觉能力。

Professor: Birds have some of the best vision capabilities in the animal kingdom.

有些鸟类的视力是人类的八到十倍。

Some bird species have vision that is eight to ten times greater than humans.

总的来说，鸟类的眼睛对它的生存至关重要。

Overall a birds' eyes are extremely important for its survival.

鸟类眼睛的一个功能是帮助它们生存，

One aspect of bird's eyes that plays a role in helping them survive,

换句话说，头骨中眼睛的作用是寻找食物或躲避捕食者。

in other words, to find food or to avoid predators is the position of the eyes in the skull.

Some birds have eyes that faced forward on the skull,

kind of similar to how humans' eyes are positioned.

面向前的眼睛能让鸟儿清楚地看到和判断距离，

Forward-facing eyes allow a bird to clearly see and judge distances,

因为它可以用两只眼睛聚焦在物体上，并正确地感知高度、宽度和深度。

because it can focus on objects with both of its eyes and correctly perceive height, width and depth.

有一种鸟的眼睛位于头骨的前部，那就是鹰。

One type of bird with eyes positioned in the front of the skull is the hawk.

鹰的视力很好，它们可以在空中从高处看到一只小老鼠。

Hawks have such good eyesight that they can spot a tiny mouse in a field from high up in the air.

它们发现了老鼠，然后俯冲下来捕捉它。

They spot the mouse and swooped down to catch it.

它们将无法发现或捕捉到它们的食物。

they would not be able to spot or catch their food.

其他鸟类的眼睛都位于头骨的两侧。

Other birds have eyes that are located on each side of the skull.

这种眼睛的定位可以帮助鸟类避开捕食者。

This positioning of the eyes can help a bird to avoid predators.

Instead of just seeing what's directly in front,

they can see things that are on either side,

允许它们在各个方向观察危险。

permitting them to watch for danger in all directions.

Imagine a duck waiting near the edge of a lake.

It needs to spend time eating grasses and insects,

但它同时也在不断地观察它的捕食者，比如狐狸。

but it also is on constant lookout for danger from its predator, like the fox.

一只眼睛盯着鸭头的每一边，让它看到一只狐狸从两边靠近。

An eye on each side of the duck's head allows it to see a fox approaching from either side.

如果它发现了狐狸，它就会飞到安全的地方。

If it spots of fox, it can then fly away to safety.

眼睛的位置对于帮助鸭子避开捕食者是至关重要的。

The placement of the eyes are critical in helping the duck avoid predators.

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 Using the examples in the lecture, explain how the position of birds’&nbsp;eyes is critical to their survival.&nbsp;
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