These ice sheet pits may appear to be lined with gold, but the precise composition of the dust that highlights the pit walls actually remains unknown.
这些冰层上的坑看上去被金边围绕。 不过这些坑洞周围一圈显眼的尘土的精确成分仍然未被人们所知晓。
The filing sheet can be detached for washing by a fingernail cutting into the pit (4).
指甲切入凹坑（4）可卸除锉片进行清洗。
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