A pitfall trap can be any small container placed in the ground with the top level with the surrounding surface and filled with a preservative.
陷阱可以是任何放置在地面上的小容器，其顶部与周围的表面齐平，并装满防腐剂。
Uses: used as glass etching agent, metal surface of the chemical polishing agent, wine of the disinfectant, preservative, mordant the fiber is also used for extraction of rare elements and so on.
用途：用作玻璃蚀刻剂，金属表面的化学抛光剂、酿酒的消毒剂，防腐剂，纤维的媒染剂，也用于提取稀有元素等。
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