求翻译：In addition, most of the firms we rate have used the extended period of low interest rates and strong credit markets to garner longer-term fixed-rate funding. To the extent that firms use variable-rate bank credit facilities for incremental borrowings, trends in transaction volume and credit will overshadow the increased cost. As we enter the second half of 2011, the balance sheets of the private investment firms we rate are strong. Competitive pressures, however, are increasing as speculative-grade bond and bank-loan markets push up corporate borrowers' leverage.是什么意思？

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