Algebra is not easy for everyone to learn, but it is very useful.
代数对每个人来说都不容易学，但它非常有用。
College algebra will not be the end of her scholarly career.
代数学并不是她学术生涯的结束。
We point out that the present representation of soft algebra is not natural.
指出了软代数现行表示的非自然性；
We point out that the present representation of soft algebra is not natural.
指出了软代数现行表示的非自然性；
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