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实用的大学英语作文400字4篇

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在日常学习、工作或生活中,大家都写过作文,肯定对各类作文都很熟悉吧,借助作文可以提高我们的语言组织能力。那么一般作文是怎么写的呢?下面是小编精心整理的大学英语作文400字4篇,欢迎大家借鉴与参考,希望对大家有所帮助。

实用的大学英语作文400字4篇

大学英语作文400字 篇1

如果我们分析海水的盐度,会发现地区间只有轻微的变化,然而有些小的变化是重要的。 导致海洋的盐度变化的基本过程有三个。

其中之一是通过蒸发的方式即把液态水转化为水蒸气来减少海洋中的水分。这样由于盐留了下来,所以盐度增大。

当然,如果这种方式走向极端,将会余下白色的盐晶体。 与蒸发相反的是降水,如降雨,由此水被加入海中,海水被稀释,从而盐度降低。 这种情形会发生在大量降雨的地区,或江河入海岸处。 因此,盐度通过蒸发减少水分而上升或通过降水或径流增加淡水成分而下降。

一般来说,在阳光很强烈的热带地区,海水的盐度略高于世界上其它没有热带那样多的蒸发的地区。 同理,在江河稀释海水的海岸地带,海水盐度略低于其它海区。

第三个可以变更盐度的过程与海洋中冰的形成和融化有关。 海水冻结时,溶于其中的物质被留了下来。 这样,在新形成的`海水冰面的正下方的海水比在冰形成之前有更高的盐度。 当然,当冰融化的时候,会降低周围水中的盐度。 在南极洲边缘的威德尔海中,结冰过程增加低温海水的盐度,从而形成了浓度最大的海水。 这些大密度的海水下沉,可以在世界海洋的深水域发现。

大学英语作文400字 篇2

英语四级现象说明文写作要点:

1、第一段,描述存在的现象,引起话题。

2、第二段,承上启下,解释这一现象的原因(原因一、二、三)

3、第三段,给出自己的观点(观点一、二、三),总结结论。

英语四级作文模板

Recently _______,what amazes us most is______________,it is ture that__________.

There are many reasons explaining__________________________ main reason is____________________.

what is more_________________________dly__________________________ a result_______________.

Considering all there,________________________ one thing_____________________,for another____________ Conclusion____________________.一种事物或现象(负面意义倾向)

大学英语作文400字 篇3

The Middle-Autumn Festival is one of the traditional Chinese festivals, it is often held in September or October. During the festival, family members get united and have mooncakes together. There are various kind of mooncakes, such as bean paste, egg-yolk or meat. The shape of a mooncake is round as it symbolizes a big moon.

Moreover, in the evening of the Middle-Autumn Festival, people get together in a vacant place, eating delicious mooncakes while appreciating the beautiful moon hanging in the dark sky. To conclude, the Midde-Autumn Festival is a very nice festival for Chinese people.

大学英语作文400字 篇4

as our society is developing,beside excellent academic achievememts,a qualified college student is also expected to cultivate various interests and capacity in social communicating,dealing with problems indepently.

today,virtue is the essence of all the noble and good college students should pay more attention to virtue cultivation. another term is should love our motherland and contribute to achieving more rapid development for the land where we were born and bred.

finally , stong health is a key health is the guarantee for achievement.

so we should be learned ,noble-minded and healthy so as to be qualified students.

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