VOA慢速英语:American History: A Dispute Over Cuba Leads to the Spanish-American War

pile up(使)成为一堆; 堆积

例句：The clouds are piling up.
      云愈积愈密。

      He piled up fallen leaves in a corner of the yard.
      他把落叶堆积在院子一角。

2.Congress agreed. It also demanded that Spain withdraw from Cuba and give up all claims to the island.

give up放弃;投降， 认输; 猜不出
 
例句：I can't answer that puzzle; I give up.
      我猜不出这个谜语, 我认输了。

      She will give up this journey.
      她将放弃这次旅行。

3.If war broke out, it said, he was to attack the Spanish naval force in the Philippines.

break out(战争、打斗等不愉快事件)突然发生, 爆发

例句：Something unexpected always breaks out in this area.
      在这一地区总有意想不到的事情发生。