This means smaller banks can cream off big profits during lending booms.这意味着在贷款业务剧增时小银行能够获得大笔利润。The booms kept the logs from flowing away.栅栏挡著原木，不让它们飘走。Large booms were brought in to help contain the oil spill.大水栅被用来防止石油漫溢。The black economy booms when there is high unemployment.失业率偏高，黑市经济就会繁荣起来。