Put those shuttle routes underground with the maglevs, and save the runway slots for the routes where you can’t justify building expensive tunnels.
把那些穿梭航线与地下的磁悬浮链接，并在那些你必须建立昂贵隧道的地方留下地铁的槽。
One possibility — a process that would inject carbon dioxide deep underground for storage — is a largely untested technology that is likely to be very expensive.
一种可能是将二氧化碳深埋于地下，不过这种技术很大程度上还没有经过检验、而且可能造价昂贵。
They believe dumping carbon underground is expensive and risky for local environments.
他们知道往地下倾倒二氧化碳非常昂贵，并承担着破坏当地环境的风险。
Let us keep in mind this expensive cost in the spring — as we live in the place where the earthquake has claimed so many lives, it seems as if we could hear 80,000 souls still breathing underground.
让我们记住一个春天昂贵的代价——我们活在死者死去的地方，仿佛听见8万个灵魂还在地下呼吸。
Because of the longer repair time for underground transmission systems, expensive duplication facilities are sometimes installed to reduce the risk of overlap-ping outages4.
由于地下输电系统的修理时间较长，因此有时就安装双套重复设施以降低重叠停电的危险。
Because of the longer repair time for underground transmission systems, expensive duplication facilities are sometimes installed to reduce the risk of overlap-ping outages4.
由于地下输电系统的修理时间较长，因此有时就安装双套重复设施以降低重叠停电的危险。
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