浮在海面上的油污正往外扩散。
关于转移：转移意味着散肿瘤向外扩散。
The metastatic part: Metastasis means the tumor spread outside its original site.
背景：甲状腺外扩散是决定甲状腺手术范围的重要因素。
Background: Extrathyroidal extension is an important factor to determine the extent of thyroid surgery.
背景：甲状腺外扩散是决定甲状腺手术范围的重要因素。
Background: Extrathyroidal extension is an important factor to determine the extent of thyroid surgery.
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