美国海关和边境防卫局工作人员对货运列表进行检查，在入境之前决定哪些货物需要精密检查。

Here, us Customs and Border Protection agents are reviewing shipping lists to determine what cargo needs close inspection before it enters the country.

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答：主要区别在于，发达国家可能具有能够发现此类疫情的较精密的监测机制以及较强大的食品安全检查体系。

A: The main difference is that developed countries may have more elaborate surveillance mechanisms to detect such outbreaks and stronger food safety systems in terms of inspections.

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机场不再是一个有趣的学习场所；它们成了拥有最精密的安全检查系统的场所。

Airports are no longer a place of education and fun; they are the most sophisticated of security sites.

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