a question for discussion; problem; task

1. 我們的教授要求他就這個(gè)課題寫篇論文。
   Our professor asked him to write a treatise on the subject.
2. 他從事于物理研究／這一課題許多年了。
   He has worked at physics/the topic for many years.
3. 主題，范圍一個(gè)題目、課題或學(xué)術(shù)興趣或專業(yè)領(lǐng)域
   A topic, a subject, or an area of academic interest or specialization.
4. 那個(gè)研究課題只取得部分成功。
   The research project was only a partial success.
5. ＂他雖然身體不好，還是堅(jiān)持這項(xiàng)課題的研究。＂
   "Though handicapped by poor health, he persisted in working at the research project."

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