今天我们要学的词是 upend.

upend 的意思是上下颠倒，掀翻。Opposition politicians in Africa face tough challenges as they struggle to upend decades of rule by the parties that originally brought liberation from colonialism. 非洲的反对派政治人士面临着艰巨的挑战，他们在努力推倒最初将非洲从殖民统治中解放出来的政党数十年的统治。

The Trump administration has proposed to require hospitals and insurers to disclose their secret negotiated rates. It could upend commercial health-care markets which are rife with hidden charges and secret discounts. 特朗普政府提议要求医院和保险公司披露其保密的议定价格。这可能会彻底颠覆充斥着隐性收费和秘密折扣的商业医疗市场。