VOA慢速英语:Many Americans Travel to Other Countries for Medical Care

短语讲解：

1. Between 750,000 and 1.8 million Americans leave the country for medical reasons every year because of the high costs of treatments and surgeries.

because of 因为，由于
例句：It is mainly because of my fault.
这主要是由于我的过错。

2. For Americans, the main destination is Mexico due to its geographical proximity and the relation(ship) between both countries.

due to 由于; 因为
例句：The team's success was largely due to her efforts.
该队的成功在很大程度上是由于她的努力。