US stocks are being propelled to fresh highs by investors borrowing a record amount of money in a high stakes gamble that is raising concerns over the potential for a sharp correction in the five-year bull run.
美国股市最近屡创新高，其推动因素是投资者借入创纪录金额的资金展开一场豪赌。这令人们担心，已持续五年之久的牛市可能迎来一次大幅回调。
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