易混淆的单词： Retroactive

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And the plan should be retroactive to mr. obama 's march 30 announcement .

计划应该可以追溯到3月30日奥巴马发表声明时。

And wto members should further improve the organization by making tribunal decisions retroactive .

世贸组织的成员国应当使审理委员会的决议具有追溯力，从而进一步改善该组织。

The criminal law is not a retroactive law .

刑法不溯及既往。

But the supreme court for more than 200 years has said that not all laws with retroactive effect are unconstitutional .

但美国最高法院200多年前曾说，并非所有具有追溯效力的法律都不合宪。

Experts say a pure retroactive extension might be constitutional , but they doubt one is feasible at this late date .

专家称，纯追溯性法规有效期延长可能是符合宪法的，但他们怀疑在这么晚的日期修改法规是否可行。