For example, some countries restrict imports by quantitative restriction.
例如，某一国家通过数量上的限定来限制进口。
A quota is a quantitative restriction that is expressed in terms of either physical quantity or value.
配额是用物品数量或价值表示的数额限制。
A quota is a quantitative restriction that is expressed in terms of either physical quantity or value.
配额是用物品数量或价值表示的数额限制。
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