据一家名为“花卉指数”的研究花卉业的私人公司指出，事实上，一半以上的玫瑰都不是成打出售的。

In fact, more than half of all roses are sold in groups of fewer than a dozen, says the Floral Index, a private firm that researches the flower industry.

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最后，构建了花卉价格指数，来反映价格变动趋势，引出规避市场风险的必要性。

Sixthly, we set up the price index to reflect the trend of price changes, which reflects that it needs to avoid market risks.

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