直接蔓延(dirrect extension)
恶性肿瘤细胞连续不断地沿组织间隙、淋巴管、血管或神经束衣侵入或破坏邻近正常组织和器官并继续生长。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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