putting a variable inside a shortcode

I need to put $accordion_title variable inside a WordPress shortcode, so I tried this code :

$accordion_title = _e( 'Delivery', 'woocommerce' );      echo do_shortcode('[accordion id="delivery"]      [accordion_item title='." $accordion_title ".' parent_id="delivery"]          SOME TEXT HERE     [/accordion_item]      [/accordion]'); 

It works but result is not accurate because Delivery phrase will print out of accordion box while I need to display it inside of accordion box:

Could you please guide me to have a modification?

Thanks in advance