Our marketing team has a theory that customers prefer shorter emails with clear prices.

我們的行銷團隊有個假設：顧客比較喜歡價格清楚的簡短電子郵件。

In theory, the shipment should arrive Friday, but customs delays are still possible.

理論上貨物應該週五到，但仍可能因海關延誤。

The manager tested her theory by tracking how flexible hours affected staff productivity.

經理追蹤彈性工時對員工生產力的影響，以驗證她的假設。