ad valorem rates的用法和样例：
- A product during a processing or manufacturing operation that, although it may not result in the change of subheading as referred to in the preceding subparagraph, has undergone a major production stage or attained an ad valorem rate of 35% or more.
- ad valorem rate of duty
- Ad valorem duty or ad valorem tax.
- A compound tariff is a combination of a specific and an ad valorem tariff.
- Ad valorem duties are levied on the basis of the product's value.