以下为句子列表：
英文: A computed tomography scan of the neck revealed variously sized low attenuation cystic lesions involving the sublingual and submandibular space, with extension into the parapharyngeal space up to the base of the skull, causing a mass effect on the surroun
中文: 电脑断层显示许多低密度囊肿占满了整个下颌间隙及舌下间隙，并延著侧咽间隙向上延伸至颅底，造成对周围组织的肿块效应。
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英文: A contrast-enhanced abdominal computed tomography scan confirmed the presence of extrinsic obstruction in the third part of the duodenum caused by the superior mesenteric artery.
中文: 经腹部计算机断层检查确认第十二指肠三部分受上肠系膜动脉外在压迫而阻塞。
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英文: A high resolution computed tomography of the chest showed multiple nodular infiltrations at the posterior segment of the right upper lobe with a thick-walled cavitary lesion.
中文: 肺部高分辨率计算机断层发现在右上肺叶的后肺小叶有许多节结状浸润，且有厚壁空洞状的病灶。
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英文: A series of staging investigations were undertaken, including positron emission tomography (PET) scan, which revealed high risk of metastasis to the cervical lymph nodes.
中文: 一系列的检查（包括正子造影）发现有高机率颈部淋巴结转移。
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英文: A tomography method of seismic reflection wave without traveltime is presented.
中文: 结合南水北调地震波勘探的资料解释问题，讨论了一种避开旅行时的地震反射波成像方法及成像理论与观测系统。
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