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。
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.
大多数地面调查都需要走很多的路,寻找一些表面上的线索,比如陶器的小碎片。
Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery.
The magnet creates a field which changes the polarity of a tiny, tiny portion of the metal particles which coat each platter's surface.
这个磁体创建一个,能改变覆盖在,磁盘表面小金属粒子的磁极。
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