每次交易这是我生活中最痛苦的部分。
This has been the most painful part of my life in every deal.
每次交易都包含顾客在一次到店期间所购买的所有商品。
Each transaction contains all the items that a customer bought at a single visit to a store.
相反，您可以将每次交易记录两次，并单独地测试性能。
Instead, record each transaction two times and measure the performance separately.
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