曹老师你好，我想了解这句话中为何要用of interest，直接用interesting不是更怎么样，这两种表达有哪些不同？
They travel by a different route to reach their destination. Andfindings like these have been of interest to biologists and environmentalscientists in a number of countries who are trying to understand thecomplexities of how changes in a habitat affect the species in it. Species likethe humming birds.
用简单的例子说明。
This is very useful. = This is of great use.
This is useless. = This is of no use.
形容词作表语，可以改为介词of+该形容词的同源抽象名词。这种of介词短语结构是书面语体，较为正式，语气也强烈一些，但意思是相同的。
