（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。
Brewster runs SpeedPro on three operating principles — growth, profitability, and efficiency — focusing on adding customers and leveraging technology to stay efficient.
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Last year, we saw savings across all of Amazon's device lineups: Echo, Fire TV, eero, and Kindle. In fact, the Kindle Colorsoft saw its first-ever sale last year. But will this sale beat Amazon's Black Friday pricing? That's still to be seen.
She said: "I think we have some very good [treatment] options, and we can usually find something that will suit everyone in amongst all of those options."