如何使TextView中的文本有两种不同的大小？

I want to write a line in a TextView where the second word is a quarter of the size of the first word. In my string.xml file I used large and small and it did not work to the extent I want it to. I also tried changing the text size in the main.xml, but it only lets you do that once in a TextEdit. Any ideas?I want to write a line in a TextView where the