VOA慢速英语:Giving Grasslands a Rest

feed on以…为食,以…为能源

例句：Silkworms feed on the leaves of mulberry.
      蚕吃桑叶。

2.Moving animals from one area of pasture to another can provide the time needed for new growth.

provide for为…提供必要条件,为…做好准备

例句：The waiter provided plenty of service for us during dinner.
       晚餐时服务生给我们提供许多服务。

provide 提供[(+for)]

例句：On Sundays his landlady provided dinner as well as breakfast.
      星期天,他的女房东不但供给早餐,还供给晚餐。

装备,供给[(+with)]

例句：Somehow she managed to provide her children with food and clothing.
      她总算设法使她的孩子有饭吃,有衣穿。

provide与supply的区别

supply也是提供，多指提供日常必需品，或武器装备等。

         句型：supply sb. with sth.或supply sth. to sb.      
例如：

Our farm supplies the market with fruits and vegetables.
我们的农场为市场提供水果和蔬菜。

All our classrooms are supplied  with electric lights.

 provide 提供,供给;是比较常用的，可以提供任何东西。

     句型：provide sb. with sth.或provide sth. for sb.   
例如：

She managed to provide her children with food and clothing.
她设法使她的孩子有饭吃,有衣穿。

3.Rotational grazing can even help prevent wildfires by keeping grasslands in good condition.

in good condition保养得很好,完好无损,健康状况良好

例句：The kitchen needs to be cleaned, but otherwise the flat is in good condition.
      除了厨房需要打扫以外，这个公寓的状况还是相当不错的。

4.As a result, less desirable plants may replace them.

replace是替换,取代的意思。

replace和sbstitute都表示替代的意思，不过用法上有所不同：

substitute的用法是：substitute A for B，意为用A代替B；

replace 的用法是：replace A with B，意为用B代替A。

例句：
1)In manufacturing, cheaper materials are constantly being substituted for the better and more expensive kind.
2.)The government decided to replace coal with gas.

还有一个词组可以表示替代的意思：take the place of sth，替代某物的位置。

5.When that keeps happening, the roots do not have enough time to recover.

这篇文章中多次出现keep一次，现在把它的用法做一下详细总结：

一、用作连系动词

构成系表结构：keep＋表语，意为"保持，继续(处于某种状态)"。其中表语可用形容词、副词、介词短语等充当。如：
You must look after yourself and keep healthy.(形容词)你必须照顾好自己，保持身体健康。
Keep off the grass.(副词)请勿践踏草地。
Traffic in Britain keeps to the left.(介词短语)英国的交通是靠左边行驶的。
注意：一般情况下，keep后接形容词较为多见。再如：
She knew she must keep calm.她知道她必须保持镇静。
Please keep silent in class.课堂上请保持安静。

二、与介词或副词搭配，构成动词短语

1.keep away意为"(使)离开；(使)不接近"，其后常接介词from。如：
Would you keep your dog away from my boy, please? 请把狗拉得离我孩子远点好吗？
Keep everybody away from the accident.人人远离事故！

2.keep back意为"阻止；留在后面"。如：
She sat down quietly, but she couldn't keep
back her tears.她静静地坐下来，却忍不住流下了眼泪。
 
3.keep together意为"在一起；动作协调"。如：
Keep together, please.请聚在一起。
The eight men kept together during the boat race as though they were one.赛船时，这8个人动作协调，好像一个人似的。

4.keep up意为"持续；使不低落"。如：
The noise kept up all night.噪音整夜持续着。
To keep your strength up, eat well and get enough sleep.为了保持力气，要吃好、睡足。
 
5.keep up with意为"跟上；和……来往"。如：
I'm trying my best to keep up with the others in class.我正在设法赶上班里的其他人。
Do you still keep up with Tom? 你和汤姆还有联系吗？

6.keep...in mind意为"把……记在心里"。如：
The teacher asked us to keep these sentences in mind.老师要我们把这些句子记在心里。
 
三、含keep的常用句型

1.keep doing sth. 意为"继续干某事"，表示不间断地持续干某事，keep后不能接不定式或表示静止状态的v-ing形式，而必须接延续性的动词。如：
He kept working all day, because he wanted to finish the work on time.他整天都在不停地工作，因为他想准时完成工作。
Keep passing the ball to each other, and you'll be OK.坚持互相传球，你们就行。

2.keep on doing sth. 意为"持续做某事"。如：
The pupil kept on asking me the same question.这个学生不断地问我同一个问题。
I kept on thinking about the match in the afternoon.我总是想起下午的那场比赛。

3. keep...from doing sth.意为"阻止/防止……做某事"。如：
The heavy snow kept us from going out.大雪使我们不能出去。