W9T2-The difficulties I have in writing my engineering classes

I am studying in faculty of engineering over 3 mouths. I think I come to understand engineering. As an engineer, you need to think critically and systematically. Sometimes, engineer also needs to express their thoughts in writhing. During the 3-mouths study, I find some difficulties I have in my engineering classes.
First, I am a Chinese-speaker. English is a foreign language to me. Although I have learnt English for over 6 years, I still cannot handle it as well as those English-speakers. When I write in English, more or less, I will be affect by the way of Chinese writing. Most of my work looks like translating from a Chinese article directly. I remembered that I was suffered in PC1222 last year, because of that problem. In PC1222 exam, there were six short questions which stated physical problems, and use what I learned in PC1222 to explain it. I found that although I knew what the principles in those questions were, I still could not express and write properly. I thought when the tutor looked at my paper; he would be suffered for understanding what I want to say. As a result, I did not get a high mark in this module. This is the biggest problem during my study.
Second, I find that my vocabulary is deficient and inaccuracy. This semester, I take SSA 2211 which talks about the evolution of a global city-state about Singapore. I need to write two essays to show how much I can understand this module. The word for each essay is 1200 to 1500 words. During writing, I found that I always repeated some words again and again, I cannot find another words to replace, and sometimes when I find a word to replace, and it perhaps cannot express what I want express well. Then when reading my essay, I think most readers will feel bored.
I think the best way to solve the difficulty is to read more engineering writing, enrich my English vocabulary and think in a English-speaker way.