If you do something readily, you do it in a way which shows that you are very willing to do it.
I asked her if she would allow me to interview her, and she readily agreed.
我问她是否允许我采访她,她欣然同意了。
You also use readily to say that something can be done or obtained quickly and easily. For example, if you say that something can be readily understood, you mean that people can understand it quickly and easily.
The components are readily available in hardware stores.
这些零件在五金商店很容易买到。