完成系统硬件设计以后，我一直忙于学习新型微处理器语言。
After completing the automated-test-system-hardware design, I was working hard at learning the language for this new microcontroller.
我现在是高三的学生了，因此我一直忙于学习，努力准备高考。
I am asenior student in high school so that I am busy with my study all the time.
我一直忙于学习，尽力了解身边的新事物——我觉得自己一直在经历文化冲击。
I've just been so busy studying and trying to absorb all the new things around me-I think I'm still experiencing culture shock.
所以，这就是你最近这么忙的原因！是的，我一直忙于我的学习。
So, that's what's been keeping you so busy recently! Yes, I've been tied up with my studies.
从这周一开始，我和李华就一直忙于学习。
Li Hua and I have been busy with our studies since this Monday.
从这周一开始，我和李华就一直忙于学习。
Li Hua and I have been busy with our studies since this Monday.
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