U.S.C.以及CFR都是美国法律。

U.S.C.全称United States Code美国法典。

The United States Code is the codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 53 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives. The U.S. Code was first published in 1926. The next main edition was published in 1934, and subsequent main editions have been published every six years since 1934. In between editions, annual cumulative supplements are published in order to present the most current information.

美国法典，是指美国对生效的公法、一般法以及永久性法律的正式汇编。由众议院的一个委员会负责监督、指导，由政府出版发行。该法典根据法律规范所涉及的领域和调整对象，划分为50个主题或卷（Title）。法典50个主题又分别按卷、章、部分、节（或按中国法律习惯称“条”）、款（*，按美国习惯用小写字母）、项（句）排列，法典最大的组成单位是卷，每一个主题对应一卷。每卷、章、部分、节、条等都用简短的文字作题注。每条均用编号标注其来源，即哪一届国会通过的哪一部法律的哪一条，或者哪一届国会进行的修改。

CFR全称Code of Federal Regulations美国联邦法规。

The Code of Federal Regulations (CFR) annual edition is the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. It is divided into 50 titles that represent broad areas subject to Federal regulation. The 50 subject matter titles contain one or more individual volumes, which are updated once each calendar year, on a staggered basis. 

《美国联邦法规》是美国联邦政府执行 机构和部门在"联邦公报"(Federal Register(登记、注册),简称FR)中发表与公布的一般 性和永久性规则的集成,具有普遍适用性和法律效应。

其中的“§”和“§§ ”都是指第……条的意思，只不过前者为单数，而后者为复数。

以下为相关双语示例，供参考：

The Transport Security Administration (TSA) requires you to provide your full name, date of birth, and gender for the purpose of watch list screening, under the authority of 49 U.S.C section 114, the Intelligence Reform and Terrorism Prevention Act of 2004 and 49 C.F.R parts 1540 and 1560. 

为了便于目标名单识别，根据《美国联邦法典》第49篇第114条，2004年《情报改革和防范恐怖主义法》 和《美国联邦行政法规 》 第4 9篇第 1540 条和1560条的规定，运输安全管理局 (TSA)需要您向其提供您的全名、出生日期和性别。