footprint
[ˈfʊtˌprɪnt]
n.
（尤指软地上的）脚印;
（地板上的）脚印;
（建筑物或设备，尤指计算机）占用的空间;
（尤指来自卫星的）广播信号覆盖区;
例句:
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The lightest footprint possible, global warming or not.
来自SA
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We all need to look for ways to reduce our carbon footprint.
我们都需要寻求降低碳排放量的方法。
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Perhaps the footprint was a hallucination.
脚印可能只是幻象。
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We saw no houses, no smoke, no footprint, no boats, no people.
我们没看到房子和炊烟, 也没看到足迹 、 船和人.
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This is the purpose of having a low footprint.
来自SA
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But we literally followed the footprint of this group.
来自VOA