Foreign demand for advanced machinery is huge; exports of civilian aircraft, drilling tools, telecommunications equipment, agricultural machinery and excavators all rose at double digit rates in 2007.
2
第一期工程方案的关键技术就是如何开凿深埋长隧洞，掘进机的采用使得这一问题得到解决。
The key technology of the first stage project is how to dig tunnels and this is to be solved by adopting excavators.
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