tumorigen致瘤物tumorn.<美>肿瘤；肿块=tumour（英）tumor lymphoepithelias淋巴上皮癌tumor of sinus of nose鼻窦肿瘤tumor in pineal region松果体区肿瘤tumor of head and neck头颈部肿瘤tumor cure probability肿瘤治愈机率tumor of parotid gland腮腺肿瘤Tumor suppression test抑瘤实验Tumors of head and neck头颈部肿瘤tumor of choroid plexus脉络丛肿瘤tumor targeting therapy肿瘤靶向治疗

1. The exact nature and cause of tumor growth are still unknown.
   肿瘤生长的具体特性及原因尚不清楚。
2. As a tumor grows it may invade neighboring tissue or organs.
   当肿瘤生长的时候它会侵袭附近的组织或器官。