1.turn sth on its head 完全改變
He decided to turn this research on its head by studying young healthy men.
他決定調轉研究方向,研究健康的年輕人
2.be reluctant to do 不愿做某事
But in practice, countries are reluctant to do so, fearful that an excessively strong currency will hurt their exporters.
但在實踐中,各國都不愿意這樣做,擔心貨幣過度強勢會影響出口