第二
先理解核心含义，再看它在真实句子里的用法。
第二
second
The radiologist examined the 2d cross-sectional images of the patient's abdomen.
放射科医生检查了病人腹部的二维横截面图像。
第二的；其次的
coming next after the first in position in space or time or degree or magnitude
In this study, we compared 2d and 3d echocardiography techniques.
在这项研究中，我们比较了二维和三维超声心动图技术。
The surgeon used a 2d fluoroscopy to guide the needle placement.
外科医生使用二维荧光透视来引导针头放置。
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Dictionary facts from ECDICT, WIKTIONARY, WORDNET.