Thought to be made from a cattle femur, this decorated Anglo-Saxon spindle whorl, used to provide weight while spinning yarn, was unearthed from farmland near Bishopstone, Buckinghamshire.
Lily JamaliNorth America Technology correspondent
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Guy Edwardes SDNPA，详情可参考同城约会
[8] R. Ulichney: “The void-and-cluster method for dither array generation” (1993). ↑