干燥的石墙看上去荒凉而且没有生命迹象，但是它们却为动植物提供了宝贵的栖居地。
Dry stone walls may appear stark and lifeless, but they provide a valuable habitat for plants and animals.
在那个星球上没有生命迹象。
但官员说矿井里面已经没有生命迹象。
But officials say there has been no signs of life from inside the pit.
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