我真的很擅长科学，但我必须承认，我从来没有真正地喜欢学习科学。
I was really good at science but I must admit I never really enjoyed studying it.
我很高兴我在英语竞赛中获得一等奖，但我也明白我必须脚踏实地继续学习。
I'm very happy about my first prize in the English competition, but I also know that I must keep both feet on the ground and learn more.
与第 (2) 种方案相同，但我一定要学习此课程才能毕业 --我 必须加入这个班。
Same as (2) above, but the class is required to graduate -- I must get into it.
我想每晚都看电影，但我必须得学习。
虽然我不愿意这么做，但我今晚必须呆在家里学习英语。
Much as I hate to do it, I must stay home and study English.
我想每晚都看电影，但我必须得学习。
尽管学校的制度很多，但我们必须遵守，这样才能有一个好的学习环境，提高学习成绩。
Although there are many school systems, but we must observe. like this we can have some good learning environment to improve grade.
但我们必须明确，企业是否为效力最强的学习工具——辅导培训，提供了足够的资源投入。
We must, however, ask whether sufficient resources are being devoted to that most powerful of learning tools - coaching.
英语写作是英语学习者必须掌握的基本技能之一，但我国大学生英语写作始终是一个最薄弱的环节。
English writing, one of the basic language skills of English learners, is the weakest among Chinese university students.
所有这些学习活动，再加上兼职工作，让我感到筋疲力尽，但我知道自己必须坚持下去。
Doing all this, including working part-time jobs, exhausted me but I knew I had to keep going.
虽然我不愿意这么做，但我今晚必须呆在家里学习英语。
虽然我不愿意这么做，但我今晚必须呆在家里学习英语。
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