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English

As Isabel underwent another eyewall replacement cycle, outflow degraded in appearance and convection around the eye weakened, and early on September 13, Isabel weakened to a strong Category 4 hurricane.

Chinese

随着伊莎贝尔进入又一轮眼墙置换周期,其表面的外流有所退化,风眼周围的对流也相应减弱,到了9月13日清晨,风暴减弱成一个较强烈的四级飓风。