Distinguished Madam/Sir: (distinguished是他们本土较官方的用语，记下。 英语没有领导这么一说，如没具体职称，不了解性别就用madam or sir, madam放前面别是对女性的尊重，是习惯）
It''s my great honor to communicate with you. （Hello太不正式，干脆给你改了句型）
Many thanks for your time to read my covering letter, and I sinserely hope that this letter could give you a nice impression about myself. I''m currently study at XXX Unniversity,major in XXX(专业，and will be graduate at XXX（年，月）. During the college education,I abided the rules and regulations strictly, showed a strong collective sense of honor, always respectful with teachers and keep a great relationship with classmates, I also believe that I''ve been cultivated with hard-working and persevering spirit since childhood. （尽量照中文意思翻译的，改成了英文能看通的逻辑关系，要是我根本就不会这么写，老外看求职信只捞干货，不看虚头巴脑、自吹自擂的）
After three years'' study in shipping operations, port operations, professional English ( Port Management ) and so on (这段课程的用词请结合你的实际), and also I''ve gained a comprehensive knowledge about modern port shipping management （改了，强调理论知识会显得你缺乏实践），. Though the 3 years college study, I''ve received certification of CET-4, CEAC,Intermediate Logistician(专业名请参照实际） . Last but not least , I''m quite skillful about the Microsoft office system and some other opration systems to support daily office work(大哥，2019都出这么久了，就别强调2003了,后面分段结构更清楚点）.
I would be really appreciate if you can offer me an oppotunity to be a member of your corporate. I''m really looking forward to work with you and other colleagues, all my wisdom and passion is everything I can guaranteed to pay back for your kindness.
书面翻译很忌讳直译字面意思，没有文化背景的文字是苍白的，有时间就多改改，一定会越改越好，住你求职顺利。 : )