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1、call for要求；需要
Some turn on the meaning of federal law. The others call for interpreting the Constitution.
有些案件涉及联邦法律的含义，另一些则需要对宪法作出解释。
2、dig into钻研；探究
Despite massive improvements in documentation over the past few years, odds are you will have to dig into the code at some point.
尽管过去几年中文档有了很大的改进，但是有时您也必须深入钻研代码。
