Under the excitation of elastic waves,local fluid flow in a complex porous medium is a major cause for wave dispersion and attenuation.When the local fluid flow
My favourite TV programme is Animal World.Firstly,I like animals very much.Secondly,the host has the ability to make the programme lively and interesting.Thirdl
Our Village School We spent a good summer holiday. When we came back to school, we found that our school had changed a lot. There were so many young trees in our school and our classrooms became new.