出国留学网

目录

托福作文范文:Raising Oysters

字典 |

2014-01-25 09:55

|

【 liuxue86.com - 托福作文 】

  《托福作文范文:Raising Oysters》是由出国留学网托福栏目小编为您推荐,希望对您的托福考试有所帮助!为了您的方便使用,您可以收藏本站.

  范文的题目:Raising Oysters。

  In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about. Next, they ”planted” fertilized oyster eggs, which within two or three weeks hatched into larvae. The larvae drifted until they attached themselves to the clean shells on the bottom. There they remained and in time grew into baby oysters called seed or spat. The spat grew larger by drawing in seawater from which they derived microscopic particles of food. Before long, farmers gathered the baby oysters, transplanted them once more into another body of water to fatten them up.

  Until recently the supply of wild oysters and those crudely farmed were more than enough to satisfy people’s needs. But today the delectable seafood is no longer available in abundance. The problem has become so serious that some oyster beds have vanished entirely.

  Fortunately, as far back as the early 1900’s marine biologists realized that if new measures were not taken, oysters would become extinct or at best a luxury food. So they set up well-equipped hatcheries and went to work. But they did not have the proper equipment or the skill to handle the eggs. They did not know when, what, and how to feed the larvae. And they knew little about the predators that attack and eat baby oysters by the millions. They failed, but they doggedly kept at it. Finally, in the 1940’s a significant breakthrough was made.

  The marine biologists discovered that by raising the temperature of the water, they could induce oysters to spawn not only in the summer but also in the fall, winter, and spring. Later they developed a technique for feeding the larvae and rearing them to spat. Going still further, they succeeded in breeding new strains that were resistant to diseases, grew faster and larger, and flourished in water of different salinities and temperatures. In addition, the cultivated oysters tasted better!

  小编推荐:

  托福作文技巧

  托福写作模板概括

  想了解更多托福作文网的资讯,请访问: 托福作文

本文来源:https://toefl.liuxue86.com/t/1869772.html
延伸阅读
托福写作对于字数的要求,不知道同学们有没有了解呢?下面就和出国留学网的小编来看看全面了解2020年托福考试作文考试有哪些新规定?一、新托福写作文章字数要求根据对ETS最新的评分标准
2020-07-17
对于托福考试来说,很多同学对于托福写作面临的困境是比较多的,那么接下来就和出国留学网来看看托福写作考试要克服哪些困境?写作困境备考托福的考生通常都会面临托福写作的3个困境;困境1:
2020-07-06
托福独立写作对于同学们来说,是比较重要的,也是比较困难的,接下来就和出国留学网一起来看看2020年托福独立写作备考细节一览表。备考须知开头段交代清楚就行,不要一味求长还记得学英语的
2020-06-16
作文是考试的重中之重,英文作文总是语法错误怎么办呢?想必是不少出国人士比较关心的问题,和出国留学网一起来看看托福写作考试要避免哪些语法错误?1."amountsof&qu
2020-06-06
托福独立写作对于很多同学来说开头和结尾段是很难写的,为了帮助大家,出国留学网的小编整理了这方面的模板,希望能帮到大家,那么下面就来看看2020年托福独立写作高分模板。托福独立写作开
2020-05-26
托福写作是托福考试中一个重点部分,也是国人考生觉得很难又没什么可以提升办法的部分。这里出国留学网给大家罗列了一些有效的提升作文水平的方法,快来看看吧。考试前1.加强词汇、语法自己的
2019-06-10
托福作文考试很重要,那么托福写作质量怎么提高呢?想必是屏幕前的你最为关心的问题,和出国留学网一起来了解了解如何提高托福作文考试质量?第一步:认真审题并分析,要明确3个方面的内容。在
2019-05-22
托福作文一直是不少学生烦恼的问题,那么托福满分作文有哪些呢?想必是不少出国人士比较关心的问题,和出国留学网一起来看看2019托福满分作文赏析!欢迎阅读。托福作文满分范文题目:Whe
2019-05-30
为了帮助在众多考生解决托福作文的常见问题,出国留学网小编整理的关于托福作文技巧的知识,希望可以帮助考生度过考试的难关,下面是小编搜集的托福满分作文该怎么写?一、举实例思维短路,举实
2019-05-07
托福作文考试很重要,那么托福写作质量怎么提高呢?想必是屏幕前的你最为关心的问题,和出国留学网一起来了解了解怎样提高托福写作文章质量?第一步:认真审题并分析,要明确3个方面的内容。在
2019-06-08