名词
中文翻译：甜背
同义词：
['illegal immigrant', 'undocumented immigrant', 'unauthorized immigrant']
例句：
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1. The sweetbacks are a growing concern for the government.
甜背问题正成为政府日益关注的问题。
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2. Many undocumented immigrants are afraid to come forward because of the fear of deportation.
许多未合法入境的移民因为害怕被驱逐而不敢站出来。
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3. The CBP has been cracking down on illegal immigration in recent years.
近年来，海关和边境保护局一直在严厉打击非法移民活动。