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Last year the obama administration tightened them further .

去年奥巴马当局进一步收紧了这项政策。

Germany has also tightened up its examination system in the past decade , to help standardise results .

为了有助于结果标准化，德国在过去的确10年也加紧了考试制度化。

Some reckon it should have tightened faster .

一些人估计它应该会更快收紧。

But immigration rules have since been tightened .

但是现在，移民政策收紧了。

Restrictions on chinese ngos were subsequently further tightened .

对中国非政府组织的限制随之进一步收紧。