核心问题
In this way, they are able to connect broadcasting stations which are a long distance from each other.
句中的 a long distance 是不是作从句的表语？
词典解答
句中的 a long distance 不是作从句的表语,而是作状语,修饰 from each other。后者用作从句的表语。下面是类似的实例：
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It's a long way from here to Cairo. 这里离开罗很远。
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The school is some distance (= quite far) away. 学校离这儿相当远。
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The town is a great distance off. 城镇离这儿很远。
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We agree on a few things but our philosophies are a long distance apart. 我们对某些事情的看法是一致的,但是,我们的人生观却相距甚远。