普及一下，比如一台相机的最高 感光度 参数为iso12800（举例，因具体机型而异）；那么感光度hi 1.0的意思就是最高感光度扩展一倍，大概是iso25600；hi 2.0 就是再翻倍相当于iso51200；.
'Grit and resilience' behind Haley Davis's incredible comeback Guelph
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