After a period of time, the gap between a and b is widening. 大体是这样，语法是没问题，请采纳，谢谢。
The gap between these extends after a span.
enlarge the gap between the poor and the rich或被动的the gap between the poor and the rich is enlarged
add 不妥，是增加的意思，一般表数量，建议改为widen ，扩大，意思就是加大了
The gap between the poor and the rich has been widened.
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林子夕silva
