短语讲解：

1. The United States has promised not to give up its fight against human trafficking.

give up 放弃; 投降
例句：Don't give up hope; keep on trying.
不要灰心，继续努力。

2. She says many families are suffering because of the group known as Islamic State, or Daesh.

because of 由于
例句：All the planes were socked in yesterday because of the thick mist.
由于雾大，昨天所有的飞机都停飞了。


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