Import restriction is effected through such measures as imposition of tariffs, fixing of quota, allowing imports only against licenses.

通过征收关税，设置配额，仅准凭许可证进口等措施实行进口限制。

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Import restriction. Import restriction is effected through such measures as imposition of tariffs, fixing of quota, allowing imports only against licenses.

进口限制。通过征收关税，设置配额，仅准凭许可证进口等措施实行进口限制。

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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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But the European Commission believes a quota on foreign players would be incompatible with EU law as it amounts to discrimination at work and a restriction on the free movement of workers.

BBC: Fifa plans talks on player quotas