With the teacher ill, we have to study by ourselves.
由于老师生病了，我们不得不自学。
And how? That is what we have to study and research.
如何办到？这是我们要研究的课题。
Besides literature, we have to study history and philosophy.
除了文学，我们还得学历史和哲学。
Besides linguistics, we have to study literature and philosophy.
除了语言学之外，我们还要学习文学和哲学。
As is known to all, library has the function of education, however, what we have to study seriously is how to make use of the function.
图书馆具有教育职能的命题已为人们所公认，但怎样去实施其教育职能是我们图书馆工作者必须认真研究和探讨的。
We have to study hard, don't we?
我们必须努力用功，不是吗？
We have to study it as we study the atom.
我们必须研究它，就像研究原子一样。
We have to study the characteristics of our own country.
这就必须研究本国的特点。
We have to study the characteristics of our own country.
这就必须研究本国的特点。
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