And while a quarterback can improvise and create , nfl defenses are savvy enough to swallow up all but the most preternaturally gifted field generals 不管四分卫有怎样充满创造力的即兴表演， nfl铜墙铁壁般的防守也能将场上最天赋异禀的领袖吞没。
If israel falters , many of its people think , the iron wall of military power that has enabled it to win grudging acceptance in the middle east will have been seriously breached 很多以色列人认为，如果此时要是以色列意志不坚，那么以色列藉以赢得中东地区勉强承认的铜墙铁壁般的超强军事力量，将受到重创。
Model sywly - 75 physics high to foam polyethylene insulating , aluminum pipe other conductor coaxial cable suitable for catv backbone project , its interior conductor adopt bastion of iron make aluminium , other conductor adopt aluminum pipe , the two have the same hot coefficient of expansion and modulus of elasticity , woods reduce in cable conductor draw the troubles that are led to the fact Sywly - 75型物理高发泡聚乙烯绝缘、铝管外导体同轴电缆适用于catv主干线工程，其内导体采用铜墙铁壁包铝，外导体采用铝管，两者具有相同的热膨胀系数和弹性模数，林减少了由电缆内导体拉拔所造成的故障。
