信任有哪些作用呢英语作文【一】
一个好的主题句是文章成功的一半。不仅文章有主题，段落有纲，句也必有中心。文章失却主题，就会不知所云;落无纲，则一盘散沙，句缺中心，就无意义。所以，在立足于篇章时，一定要首先明确文的主题;在发展段落时，也要首先写好主题句。从PETS三的特点来考虑，主题句最好是置于文首或段首，这样让人一目了然! 以下就是两个实用的开门见山式发展主题句的方法。
●To begin with, we must attach the greatest importance possible to this issue/fact (key word.
●As is well known to all, it is now high time that we took this (topic word into serious consideration.
信任有哪些作用呢英语作文【二】
用简明的语言对某一概念的本质特征作规定性的说明叫下定义。下定义能准确揭示事物的本质，是科技说明文常用的方法。
下定义的时候，可以根据说明的目的需要，从不同的角度考虑。有的着重说明特性，如关于“人”的定义；有的着重说明作用，如关于“肥料”的定义；有的既说明特性又说明作用，如关于“统筹方法”和“应用科学”的定义。
①人是能制造工具并使用工具进行劳动的高级动物。
②肥料是能供给养分使植物生长的物质。
③统筹方法，是一种安排工作进程的数学方法。
④工程技术的科学叫做应用科学，它是应用自然科学的基础理论来解决生产实践中出现的问题的学问。
无论从什么角度考虑，无论采用什么方式，只要是下定义，就必须揭示事物的本质，只有这样的定义才是科学的。比如，有人说：“人是两足直立的动物。”这个定义就是不科学的，因为它没能揭示事物的本质。“人是能制造工具并使用工具进行劳动的高级动物。”这才是科学的定义，因为它揭示了人的本质。
信任有哪些作用呢英语作文【三】
好的文章动静结合、张弛有度有节奏感。句式也是一样，要有变化性，这不仅能使文章更生动，也是语言表达方式的需要和表达能力的体现。句式的`变化，主要是要注意两点：
● 不要从头至尾使用一种句型。
● 长短句结合。
由于语言功底的欠缺和惯用思维，很多人写的文章一种句式到头，如：
I think …
I hope…
He does it.
He will take it
这样的文章虽然意思表达出来了，却显得呆板，欠生动。解决的办法是：
1.间或使用主从复句。
Because he is very much determined, he will carry it out this time. (原因
比较：He is very much determined. He will carry it out this time.
2.使用分词结构句。
The weather being fine, a large number of people went sightseeing.
比较：The weather is fine. A large number of people went sightseeing.
Africa is the second largest continent, its size being about three times that of China.
比较：Africa is the second largest continent. Its size is about three times that of China.
3.使用不定式句。
To be or not to be, that is a question. (莎士比亚
To study or not to study, that is much different.(引申
To do it well, you must plan it well.
比较：You want to do it well. And you must plan it well.
4.倒装句
Only when we fully recognize its importance can we have control of its essence.
比较：After we fully recognize its importance, we can have control of its essence.
No sooner had he arrived home than it began to rain.
比较：He arrived home. And it began to rain.
5.失衡句
whether or not he will come is still unknown to all the people present.
比较：No one present knows whether he will come or not.
That he has done it all by himself is known to everyone.
比较：Everyone knows that he has done it all by himself.
当然，句子并不是越长越好，也不是越复杂水平就越高。凡事皆有度。太多长句的堆砌让人觉得是买弄。有时侯，一个短小精辟的句子可以起到画龙点睛的作用。特别是在文末段尾。比如：
●As a creature, every one knows.
●Actions speak louder than words.
●Practice makes perfect.
信任有哪些作用呢英语作文【四】
说明文方法有哪些作用
