不过，埃及正在建造深入沙土的钢铁屏障，以阻止秘密的地下交通。
But Egypt has been building an iron barrier, sunk deep into the sandy soil, to thwart this subterranean traffic.
它还施行了一项由美国资助的耗资巨大的工程，沿埃及与加沙的边境向地面打入一道钢铁屏障，从埃及一侧封堵住无数的地下通道，这些通道是加沙赖以存活的生命线。
It has gone along with a costly American-funded scheme to sink a steel barrier into the ground along its Gaza border in order to block the tunnels from Egypt that have become Gaza's lifeline.
它能够穿透现有铁锈而渗透进钢铁部件的细微孔隙中，从而创造了一个阻断铁锈生成的活性保护屏障。
Penetrating existing rust it further embeds into the pores of metal, creating an active barrier of protection that migrates to inaccessible areas.
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