1.This legislation though is gaining some momentum from the recent egg recall that has caused a lot of concerns about salmonella.

gain some momentum获得动力，获得势头

2.I want to break down exactly what this is.

break down分析

3.Older people, young babies and people with immune problems are going to be most at risk.

with immune problems是介词短语做后置定语，修饰people。
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