Often major economic shifts are gradual enough not to be distinguishable at first from ordinary fluctuations in the financial markets.
enough偏向于主观判断,不符合逻辑语境;not to be distinguishable不如to be indistinguishable简洁
enough to, so/such…that…, so/such…as to三者都表示结果,区别在于:enough to表示主观满足,在标准书面语中很少使用; so/such...that不用考虑逻辑主语问题; so/such...as to逻辑主语等于句子主语,即句子主语可以执行as to后面动词所表达的作用
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