In places, the nodes have many connections with their neighbours, but the network also contains random and often long links between nodes that are very far away from one another.

在某些地方，节点有很多与他们邻居的联系，但是网络同时也包含了随机性，而且经常在两个节点间有长距离的连接。

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But it also spreads out the risk of pollution over a very long period.

但是这样一来也大大延长了可能造成污染的时间。

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That may sound like a good thing because it reduces methane emissions and leachate. But it also spreads out the risk of pollution over a very long period.

垃圾不降解这可以降低沼气的产生听起来这似乎是个好事情，但却大幅延长了污染风险存在的时间。

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"First, they are very narrow, but they are also very long, " explains Avouris.

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But United also says that not all very long-haul routes merit first-class service.

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"It is a tremendous tragedy and it is a tremendous loss but it has also made many of us think very long and hard about what we do and how we do it and try and be better, " she said.

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