短语讲解：

1. He says it is too costly and difficult for him to see a heart specialist in the city.

too...to 太…以至于不能
例句：It's too early to tell.
现在做判断还为时过早。

2. The government of Cameroon has not been able to provide the device to hospitals in need.

be able to 能，会; 能够
例句： I admire the way she is able to shrug off unfair criticism. 
我很佩服她能对错误的批评意见不予理会。  
 
3. But he is more interested in investors who share his vision.

be interested in 对…感兴趣; 关心
例句：Perhaps you'd be interested in red roses.
也许你会对红玫瑰感兴趣。
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