铁路交叉路口的安全闸正在放下来。
流行的做法是实行安全闸，这种方法可以做到安全有效的单向数据传输，但是安全成本太高，硬件价格昂贵。
The prevalent method is to implement the safe floodgate, the safe and effective one-way data transmission method, but the safe cost is too high and the hardware costs too expensive.
在国内，网闸技术是一项新兴的网络安全技术。
Interiorly, NetGap is a new technology in network security field.
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