听力原文： Can this bird help alleviate the pain caused by some common ailments? Well, its bite certainly won't help matters, but its oil just might. Emu oil, a legendary treatment first used by Australian aborigines hundreds of years ago, is produced by rendering fats from the bird. The aborigines used it to treat their wounds. Today, this folklore remedy is getting new attention from scientists. A team of researchers from Australia' s Adelaide Women' s and Children' s Hospital is trying to find out, once and for all, if the flightless bird truly possesses healing powers, and they' ye been encouraged by previous tests that have demonstrated the oil' s value, especially, in the treatment of arthritis This is the end of Listening Comprehension. What is the passage primarily concerned with?