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1. That's because Congress has always envisioned joint federal-state immigration enforcement and explicitly encourages state officers to share information and cooperate with federal colleagues.
重点词汇：
Congress国会  
envision想象，预想
immigration移民
enforcement实施
explicitly明确地
colleague同事
结构划分：
① That's= That is because...(主系表结构，because引导表语从句)
 ②because Congress has always envisioned joint federal-state immigration enforcement and explicitly encourages state officers to share information and cooperate with federal colleagues.
语法分析：
because Congress has always envisioned......cooperate with federal colleagues为because引导的表语从句，其中Congress为主语，and并列两个谓语动词has always envisioned和encourages，encourage sb to do sth鼓励某人做某事。
参考译文：这是因为国会一直希望联邦和州联合实施移民执法，并明确鼓励州官员与联邦官员分享信息并且合作。
2. Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day , often with Colgate, Crest or one of the other brands.
重点词汇：
shrewd精明的 
campaign宣传活动
habitually习惯地；日常地 
cavity-preventing 防蛀牙
scrub擦洗
结构划分：
① because of shrewd advertising and public health campaigns
②many Americans habitually give their pearly whites a cavity-preventing scrub twice a day
 ③ often with Colgate, Crest or one of the other brands
语法分析：
句子主干：Americans habitually give their pearly whites a cavity-preventing scrub twice a day，其中give their pearly whites a cavity-preventing scrub为双宾语结构，give sb sth给某人某物，pearly whites为间接宾语，a cavity-preventing scrub为直接宾语，twice a day为状语，译为“每天给他们珍珠般洁白的牙齿做一次预防刷洗”；with Colgate, Crest or one of the other brands为状语，译为“用...”；because of...为原因状语。
参考译文：而今天，受到精明的广告活动和公共卫生动的影响，许多美国人会习惯性地每天给他们珍珠般洁白的牙齿做一次预防刷洗，他们使用的，往往就是高露洁、佳洁士或者其他某种品牌。
3. In short, the image that best represents the current crisis is the stereotypical cartoon scene of a man sitting at the breakfast table with a newspaper held up in front of his face, while a woman glares at the back of it, wanting to talk.
重点词汇：
In short简而言之  
represent代表
stereotypical 典型的
scene 场景
held up in front of his face举起来挡着脸
glare at怒视，瞪视
结构划分：① the image is the stereotypical cartoon scene of a man
② that best represents the current crisis
③ of a man sitting at the breakfast table with a newspaper held up in front of his face
④ while a woman glares at the back of it, wanting to talk.
语法分析：
句子主干: the image that best represents the current crisis is the stereotypical cartoon scene,其中that引导定语从句修饰先行词image，主干译为“最能形象表现目前这种危机的是这样一幅漫画场景”；of a man sitting at the breakfast table with a newspaper held up in front of his face, while a woman glares at the back of it, wanting to talk为后置定语，修饰scene，描述卡通场景的内容，其中sitting at the breakfast table为V-ing短语作后置定语修饰a man，held up in front of his face为V-ed短语作后置定语修饰newspaper。
参考译文：简言之，最能形象表现目前这种危机的是这样一幅漫画场景：一个男人坐在早餐桌边，手里拿着挡住脸的报纸，而一个女人怒视着报纸后面，很想交谈。
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