One example of a main category might be customer, and subcategories for customer might be high-value and low-value.

主类别的一个示例可以是customer，而customer的子类别可能是high - value和low - value。

youdao

With a sincere heart to be economical, low carbon efficient type procucts to each customer, to create value for customers;

以真诚心将经济节约型、低碳高效型的产品带给每个客户，为客户创造价值；

youdao

With masterful technology and innovative ideas, our factory always provides low price and high quality products and high value-added services to customer.

凭着精湛工艺和勇于创新的理念，我厂一直为客户提供价廉质优的产品和高附加值的优质服务。

youdao

Companies around the globe are learning that while cloud computing has many virtues, perhaps chief among them is its ability to help business leaders shift huge chunks of IT budgets away from low-value infrastructure and toward customer-facing growth and innovation.

FORBES: The Cloud Revolution and Creative Destruction

The question is how advertisers will weigh the potential value of customer information against the low CTR going forward, and what the company will or can do to improve CTR.

FORBES: Facebook Valuation: We Don't Know What We Don't Know

Dear CIO: For the past couple of years, your CEO and CFO have been threatening to bring down the sky unless you and your team began rebalancing the ratio of IT spending away from costly and low-value infrastructure and legacy baggage and toward customer-facing growth opportunities.

FORBES: Dear CIO: Is The Time Bomb In Your IT Budget About To Explode?