Study English - New store lets you shop, walk out and pay later

article

http://www.breakingnewsenglish.com/1612/161207-grocery-store.html

words

unveil

- remove a veil. uncover

 

Amazon just unveiled a grocery store without lines or checkout counters.

http://www.theverge.com/2016/12/5/13842592/amazon-go-new-cashier-less-convenience-store

queues

- a line of people or vehicles waiting for something

trialled

- tested. kind of test

high street

- expensive store street

brick-and-mortar

- offline store

tough nut to crack

- can't understand. difficult problem