ad valorem freight

例句：

1. 1. The company charges a premium for its high-quality goods, which is ad valorem freight.
   该公司对高品质商品收取额外费用，这是按价值计算的运费。
2. 2.The shipment was charged at the rate of $1 per kilogram, which is ad valorem freight.
   该货物按照每公斤1美元的价格计费，这是按价值计算的运费。
3. 3.The importer has to pay a higher tariff on goods that are subject to ad valorem freight.
   进口商对按价值计算的运费征收更高的关税。