at a time 是每次的意思,那么three at a time 和two at a time

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• 解释一个VOA的句子前文意思：英国打独立战争遇到的其中一个问题是英国需要跨越大洋去运输军队和补给.然后有了下面这一句：It was difficult to bring in more forces and supplies,and it took a long time.这里的bring in改成bring可行吗?如果可行,有in和没in在表达上有什么区别、或微妙的差异?
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