The immune system is literally the body's first and last line of defence against illness and disease, so the stronger it is, the better. (anabolicsmall.com)
Likewise, Atleti have been steely in defence with Jan Oblak proving to be a worthy last line of defence in goal with a string of impressive displays, most notably in the semi-final against Bayern Munich where he had over 34 shots on goal and saved a Thomas Muller penalty to help send Atletico to the final. (footballticketpad.com)
The ventilation shafts were disguised as wells, and chunky rolling - stone doors served as last lines of defence. (lonelyplanet.com)