further than

You have nothing to do with the master of Thornfield,further than to receive the salary he gives you for teaching his protégée，and to be grateful for such respectful and kind treatment as，if you do your duty，you have a right to expect at his hands.Be sure that is the only tie he seriously acknowledges between you and him:so don't make him the object of your fine feelings，your raptures，agonies，and so forth.

你和桑菲尔德的主人之间，除了教他的被保护人，接受他付给的薪水、并感谢他在你克尽厥职后理所当然给予你的尊重和厚待外，没有任何关系。你要明白，这是你和他之间唯一得到他真正承认的一种关系，所以，别把他当作你抛洒柔情、喜悦、烦恼以及凡此种种情绪的对象。（《简爱》）

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这里，further than 的意思是“除了”。相当于except for,beyond。

than之后的不定词加to。