there are many organizations to help the deaf and blind ,请问里面的to _英语解答

there are many organizations to help the deaf and blind ,请问里面的to 是什么成分,或者启一个什么
作用,及为什么要加这样一个to

人气：111 ℃　时间：2020-02-03 14:13:40

解答

to help the deaf and blind,构成动词不定式（to + 动词原形）短语,此短语做organizations的定语