短语讲解：

1. And the improved relations have led to an increase in the number of U.S. visitors to Cuba.

lead to 导致; 把…带到
例句：Economic models often lead to the study of systems of equations.
经济模型经常导致对方程组的研究。

2. And, he adds, the foreigners cannot control who works for their company in Cuba.

work for 受雇于; 为…而工作; 效劳
例句：Comrade Yang will be in charge of that work for the time being.
杨同志将暂时负责那项工作。

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