女性,右乳房内肿块 4×3cm,皮肤略回缩,基底不固定,右腋下 2.5×1.5cm活动的淋巴结2个,质硬,病理证实为乳癌淋巴结转移。按国际标准,应属于: ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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