The singular focus on the exchange rate appears based on the assumption that it is the key cause of the surplus and the main policy instrument for removing it.
把注意力完全集中在汇率上面，似乎是基于以下假设：它是盈余的主要根源，也是消除盈余的主要政策工具。
The best policy instrument is the exchange rate.
最有效的政策工具是汇率。
The best policy instrument is the exchange rate.
最有效的政策工具是汇率。
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