本周早些时候，包括美国铝业、卡特彼勒公司和杜邦公司等10家企业联合要求国会尽快建立温室气体配额交易制。

Earlier this week ten companies, including Alcoa, Caterpillar and DuPont, called for Congress to set up a cap-and-trade system for greenhouse gases as quickly as possible.

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然后，本周又有报道称，联合国世界粮食计划署(UN World Food Programme)可能不得不对粮食援助实行配额制。

Then came this week's report that the United Nations' world food programme might have to ration food aid.

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