个人认为
扩大

spread是应该减少。investopedia.com上的解释： One indication of a flight to quality is a dramatic fall of the yield on government securities, which is a result of the increased demand for them.

1# fish_1984 扩大，因为买国债的人必定会抛售手上的corporate bond, treasury yield goes down, corporate yield goes up.

扩大，公司债等比国家更加便宜了，spread更大

spread是应该减少。investopedia.com上的解释： One indication of a flight to quality is a dramatic fall of the yield on government securities, which is a result of the increased demand for them.
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看清楚这段意思，再说。。。怎么能是减少呢