The little boy can already do simple problems.
这个小男孩已经能做简单的题了。
The little boy can already do simple problems in addition and subtraction.
这个小不点孩子都已经会做简单的加减法问题了。
Jack is so smart a boy that he can work out difficult maths problems quickly.
杰克很聪明，因而他能很快的解出数学难题。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
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