This includes running tracks above or below roadways to avoid railroad crossings and fencing off areas to avoid collisions with animals, people and road vehicles.

这包括运行轨道要高于或低于现有铁路以避免平交道，与其他区域隔离以免与行人、动物、公路车辆碰撞。

youdao

To help understand the next step we can think of this process as follows: one replicator (genes) built vehicles (plants and animals) for its own propagation.

为了帮助理解接下来的步骤我们可以这样考虑这个过程：一个复制因子(基因)为了自己的生存繁衍建造了一些运载者(植物和动物)。

youdao

These vehicles - the lumbering robots, as Richard Dawkins calls them - are animals and plants, the prolific and exquisitely designed products of the first replicator.

这些运输工具〔理查德·道金斯称之为“伐木机器人(lumbering robot)”〕就是动物和植物，它们是第一复制因子多产的、设计精巧的产物。

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The system is evidently able to distinguish between vehicles, animals, and humans -- and it can even differentiate between different types of human activity, including walking, running, and digging.

ENGADGET: UA engineers develop 'invisible,' fiber optic border monitoring system

Apprentices must train for years under master guides and don't just learn to spot and track animals from the comfort and safety of their vehicles.

WSJ: Walk With the Animals

In the long run, though, it seems the train has reduced the pollution formerly caused by cars and trucks and reduced the number of animals killed by vehicles driving through the park.

BBC: Eco-scorecard to the world��s great attractions