英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

时差N小时 植物的自我防御

时间:2021-08-26 09:14来源:互联网 提供网友:nan   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

Plants may appear to be helpless in the face of hungry,toothy animals but many plants have evolved interesting systems of self-defense1.

植物在饥饿的咀齿动物面前似乎毫无防御,然而许多植物已经进化出了有趣的自我保护体系。

Coarse meadow grasses are a good example.

粗糙的蓝草是一个很好的例子。

If you run your finger along a blade of coarse grass,you just might cut yourself.

当你的手指滑过它的叶子,很可能将自己划伤。

What makes it so sharp?

它为什么如此锋利呢?

A row of microscopic2 silica blades lines thegrass like tiny teeth, and most grasses have silica inside as well.

因为在蓝草叶片边缘有一排细小的像牙齿似的硅片,并且大部分蓝草体内也含有硅。

Although the silica doesn’tprevent animals from feasting on the grass, it is hard enough to wear down the animals'teethover time.

虽然这些硅质不能阻止动物的尽情咀嚼,但它的硬度很高,长期食用会磨损动物的牙齿。

Imagine trying to chomp3 that tough meadow grass with dull, worn teeth, you wouldn’tget too far!

试想一下,用又老又钝的牙齿咀嚼那样的牧草,显然不会逍遥很久。

The grasses must have evolved this bristling4 defense fairly early in their relationship with grazinganimals, because the anatomy5 of the animals'mouths has changed in response.

蓝草一定很早以前就在与草食动物的“对抗”中进化出这种密集的齿状硅片。因为动物的口腔结构发生了相应的变化。

The teeth ofmost mammals stop growing in adulthood6.

大多数哺乳类动物的牙齿在成年以后就停止了生长。

But, the teeth of grazing animals like horses and cowshave evolved in a different way.

但是马和牛等食草动物的牙齿,却产生了不同的进化。

They continue to grow from the roots over the course of theanimals'lives.

它们从牙根不断生长,贯穿动物的整个生命周期。

As the grasses'silica blades wear away the teeth, continuous growth from the rootsat least partially7 compensates8 for the loss.

由于蓝草的硅片磨损牙齿,从牙根不断生长的牙至少部分弥补了磨损。

If an animal’s diet consists mostly of coarse meadowgrasses with silica blades, the animal still could develop extensive wearing and damage to its teeth.

如果食草动物的食物以这种粗糙蓝草为主,那么磨损仍会加剧并对牙齿造成伤害。


点击收听单词发音收听单词发音  

1 defense AxbxB     
n.防御,保卫;[pl.]防务工事;辩护,答辩
参考例句:
  • The accused has the right to defense.被告人有权获得辩护。
  • The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。
2 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
3 chomp NrAzV     
v. (人、动物进食时)大声地咬,嚼得很响
参考例句:
  • I lost a tooth while chomping on a French baguette!我啃法棍面包时,崩掉了一颗牙!
  • They just chomp on tundra, nap a few hours and feast again.它们只是在苔原上大嚼特嚼,睡上几小时,接着再吃。
4 bristling tSqyl     
a.竖立的
参考例句:
  • "Don't you question Miz Wilkes' word,'said Archie, his beard bristling. "威尔克斯太太的话,你就不必怀疑了。 "阿尔奇说。他的胡子也翘了起来。
  • You were bristling just now. 你刚才在发毛。
5 anatomy Cwgzh     
n.解剖学,解剖;功能,结构,组织
参考例句:
  • He found out a great deal about the anatomy of animals.在动物解剖学方面,他有过许多发现。
  • The hurricane's anatomy was powerful and complex.对飓风的剖析是一项庞大而复杂的工作。
6 adulthood vKsyr     
n.成年,成人期
参考例句:
  • Some infantile actions survive into adulthood.某些婴儿期的行为一直保持到成年期。
  • Few people nowadays are able to maintain friendships into adulthood.如今很少有人能将友谊维持到成年。
7 partially yL7xm     
adv.部分地,从某些方面讲
参考例句:
  • The door was partially concealed by the drapes.门有一部分被门帘遮住了。
  • The police managed to restore calm and the curfew was partially lifted.警方设法恢复了平静,宵禁部分解除。
8 compensates 66643d75881387c68c4962ba4b92c1c9     
补偿,报酬( compensate的第三人称单数 ); 给(某人)赔偿(或赔款)
参考例句:
  • The company compensates her for extra work. 公司因她的额外工作而给她报酬。
  • A vertical spring compensates for the weight of the sensing element. 用一根垂直弹簧补偿敏感元件的负荷。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   时差N小时
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴