比如有了1987年美国股市崩盘的前车之鉴，全世界都知道了设立熔断机制的重要性；但如果设计不当，这种改革反而会增加波动性。
For example, since the 1987 stock-market crash in the United States, the importance of having circuit breakers has been recognized; but if improperly designed, such reforms can increase volatility.