2009年，在美国禁止墨西哥货车越过边境后，墨西哥对美国货物收取了价值23亿美元的关税。
In 2009 Mexico imposed tariffs on $2.3 billion of American goods, after the United States stopped letting Mexican lorries past the border area.
另一个危险是一项有价值的关于基于危机的边境管制试验将被终止。
Another danger is that a worthy experiment with risk-based border controls will perish.
受唐代边境战争性质不同认识的影响，人们历来对唐代边塞诗的主题价值有不同的评论。
Influenced by different opinions of the nature of frontier wars in the Tang Dynasty, people have different comments all the time on the theme value of the frontier fortress poems of the Tang Dynasty.
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