at one's best中等

At its best, the European project is remarkably liberal: built around a single market of 27 rich and poor countries, its internal borders are far more open to goods, capital and labour than any comparable trading area.

在最好的状态下，欧洲一体化计划是非常开放自由的：它以由27个富国和穷国组成的单一市场为基础，其内部边界对商品、资本和劳动力的开放程度远远超过任何同类贸易区。