where's the resources/sap-ui-core.js?

hi Guys,

I'm a starter of SAP UI5. I created a ui5 project using the eclipse project wizard.

In the index.html file, there's the bootstrap in the red box:

My question is: where's this resources folder? I looked all over the project structure, I didn't find a clue.

Could you tell me how does this line of code links to the sap-ui-core.js in detail?

Thanks !!