In those days most tariffs were levied on the volume of imports (so many cents per pound, say) rather than value.
当时，多数关税是根据物品数量征税（例如每磅多少美分），而不是根据价值征税。
Thermal blacks were once used as low cost rubber compound extenders in order to reduce the pound volume cost of the product.
为了降低制品的磅体积成本，热裂炭黑曾用作低瘟胶斟的增鼍荆。
The pound region volume of the baffle C type is still too small, so the liquid steel can't mix sufficiently, and the average residence time in the tundish is short.
型挡墙，冲击区体积较小，钢液混合不均匀，钢液在整个中间包内的平均停留时间较短。
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