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大学梦作文300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。
大学梦作文300字篇2
some people believe (argue, recognize, think) that 观点1. but other people take an opposite side. they firmly believe that 观点2. as for me, i agree to the former/latter idea.
there are a dozen of reasons behind my belief. first of all, 论据1. more importantly, 论据2. most important of all, 论据3.
in summary, 总结观点. as a college student, i am supposed to 表决心. 或 from above, we can predict that 预测.
大学梦作文300字篇3
friends play an important part in everyone’s life.
some people make friends for their own benefits.
a friend in need is a friend in deed.
1)friends influence your development, maturity and sense of responsibility.
2)these people are not reallyfriends. they only want to be your friends if it
is to their advantage. by this time you should know who are your true friends.
3)a true friend is eager to help you whenever necessary. you can consider yourself very lucky if you have one true friend. you and your true friend have a good understanding of each other
大学梦作文300字篇4
recently i have been very anxious ,and i cannot wait to need your advice.during summer holiday,i plan to go on a trip to guilin with my parents.as is known to us all,mountains and rivers in guilin are world-famous.in fact,it is the place that i always dream of going to.
however,next term i will be a student of grade three in high school,and that means i will have more exercies to finish and less time to play.moreover,other students work hard every day.
how should i make a decision? i'm looking forward to hearing from you.
大学梦作文300字篇5
recently, some cities are considering 主题词, which has raised people's concern.
some people say that 观点一. and 继续阐述观点一. for example, 此处可举一个常见的例子，更具有说服力. however, some others are opposed to the idea. they argue that 观点二. besides, there are 继续阐述观点二 , for example, 举与观点二相关的例子.
as far as i am concerned, i'm against the 不赞同的观点. because 原因, and 原因. i believe we should 做法. i think we all have responsibility to....
大学梦作文300字篇6
你喜欢我吗？ do you like me ?
hello! everyone. i’m a little rabbit. my name is hanhan.
look! i’m very lovely. my eyes are red. my ears are long. my
hair is white. my tail is short. i like carrots very much. i have
a good friend. she’s my little master. her name is zhou xun.
we always play games together. i like her very much and she likes me, too.
大家好！我是一个小兔子。我的名字叫韩寒。
看!我很可爱。我的眼睛是红色的。我的耳朵是长的。
我的头发是白色的。我的尾巴很短。我非常喜欢吃胡萝卜。
我有一个好朋友。她是我的小主人。她的名字是周迅。
我们总是一起玩游戏。我非常喜欢她,她喜欢我。
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