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In the event that a calculation appears to be running excessively long, one can abort the
calculation by selecting Evaluation from the Mathematica menu strip and then choosing Abort
Evaluation. A calculation is in progress when the thickness of the cell bracket on the rightmost
edge of the notebook window increases and appears as a thick black vertical line.
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原文地址：http://www.cnblogs.com/goodmangis/p/4204498.html
