Spurred on by rather unappetizing U.S. battlefield food known as Meals Ready to Eat,scientists at the Army Soldier Systems Center in Massachusetts have devised a vacuum-sealed sandwich that stays edible for up to three years.

• 由于以往美国前线上供应的“速食食品”实在难以下咽，于是位于马萨诸塞州的“军队战士中心”发明了一种真空包装的三明治，这种三明治的保质期可以长达3年。