Class one has fewer students than Class two.
The number of students in Class one is smaller than that of Class two.
There are less students in class one than those in class two.
那个后面的空应该在than后面吧~！
class one are fewer than class two
或者
there are more students in class one that class two
或者
students of class one is some more class two
Class than the students of class 2 less
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