she devoted her life to helping the poor.

问题描述:

she devoted her life to helping the poor.
这句话的意思我能够理解,但to helping还要请帮忙解释下了哈.
为什么不是help(动词) the poor,要用ing呢,这样的话是不是to teaching math也可以哈,

to这里是介词,后面要用动名词
devote to致力于