既然大多数清洁能源项目的效益回报期都在5年以上，那么“配额-贸易”制度并不能鼓励环保投资。

Since most clean-energy projects have a payback period of more than five years, the system thus fails to encourage green investment.

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这将有助于确保每年发放的移民签证最大配额符合国会预期，将使美国移民排期表的最终发放日的每月波动最小化。 。

This will help ensure that the maximum number of immigrant visas are issued annually as intended by Congress, and minimize month-to-month fluctuations in Visa Bulletin final action dates.

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