 Combining with existing results of approximation from shift-invariant spaces, we are able to estimate the approximation rates of classical function spaces such as Sobolev spaces and Besov spaces  .
<clarity>  Combining with existing results of approximation from shift-invariant spaces, we are able to estimate the approximation rates of classical function spaces such as Sobolev spaces and Besov spaces  .
 As applications of our main results, the approximation rates of classical function spaces such as Sobolev spaces and Besov spaces .