大學英語作文300字五篇

在學習、工作乃至生活中，大家都經常接觸到作文吧，寫作文是培養人們的觀察力、聯想力、想象力、思考力和記憶力的重要手段。相信很多朋友都對寫作文感到非常苦惱吧，下面是小編精心整理的大學英語作文300字5篇，歡迎閲讀與收藏。

如果我們分析海水的鹽度，會發現地區間只有輕微的變化，然而有些小的變化是重要的。 導致海洋的鹽度變化的基本過程有三個。

其中之一是通過蒸發的方式即把液態水轉化為水蒸氣來減少海洋中的水分。這樣由於鹽留了下來，所以鹽度增大。

當然，如果這種方式走向極端，將會餘下白色的鹽晶體。 與蒸發相反的是降水，如降雨，由此水被加入海中，海水被稀釋，從而鹽度降低。 這種情形會發生在大量降雨的地區，或江河入海岸處。 因此，鹽度通過蒸發減少水分而上升或通過降水或徑流增加淡水成分而下降。

一般來説，在陽光很強烈的熱帶地區，海水的鹽度略高於世界上其它沒有熱帶那樣多的蒸發的地區。 同理，在江河稀釋海水的海岸地帶，海水鹽度略低於其它海區。

第三個可以變更鹽度的過程與海洋中冰的形成和融化有關。 海水凍結時，溶於其中的`物質被留了下來。 這樣，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鹽度。 當然，當冰融化的時候，會降低周圍水中的鹽度。 在南極洲邊緣的威德爾海中，結冰過程增加低温海水的鹽度，從而形成了濃度最大的海水。 這些大密度的海水下沉，可以在世界海洋的深水域發現。

My friend Vivi is a lively and smart girl,she has long black hair and she is a tallest girl in our is warm-hearted and good- looking so that everyone loves her.I'm so glad to make friend with her.I'm out-going too,so we have been good friends for long sometimes I like quiet but she doesn' her marks are not good as ,i suggested her that she should work-hard in her study so that we can go to the same university.

This person is my best friend Vivi who i can tell everything my deeply feelings and thoughts

Chinese New Year is the longest and most important celebration in the Chinese calendar. Chinese months are reckoned by the lunar calendar, with each month beginning on the darkest day. New Year festivities traditionally start on the first day of the month and continue until the fifteenth, when the moon is brightest. In China, people may take weeks of holiday from work to prepare for and celebrate the New Year.

結語：春節到了，意味着春天將要來臨，萬象復甦草木更新，新一輪播種和收穫季節又要開始。

The world is enveloped in moonlight. A poetic feeling arises and softness pervades the atmosphere. At this time, a breeze of ten accompanies the silvery light of the moon and gives the world a peculiar appearance and the people a peculiar feeling. The air is suffused with a sweet scent, driving away the ugliness and squal or of the daytime, soothing the distressed and wretched souls. If

you sing a song, your voice will reach the clouds. If you read a poem, it will echo in the mountains and valleys far away. If you hum a lullaby, its rhythm will send the whole sleepless city to dreams.

july 20th 1969 was an important day for the human american astronauts landed on the moon. it was the first time for man to be on the moon. as soon as they got there, they put a television camera on the moon in order to let the people on the earth watch them on tv at home. before they left the moon, they collected some moon rocks and brought them back to the earth. a new age of eploration began.