要执行挖掘，必须先告知算法，在哪些列能找到实际的商品，在哪一列包含如何将商品组合成交易的相关信息。

To perform mining, you have to tell the algorithm in which columns it finds the actual items and which column contains the information on how to group items into transactions.

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多年来，对特定的农业商品都有成交量限制。

Certain agricultural commodities have had position limits in place for years.

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在成交量限制法规的推行之际，甚至在美国商品期货交易委员会内部仍然有许多批评之声。

As the rules careen forward, position limits still have many critics, even at the CFTC.

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