求翻译：而此前的2011年11月30日，随着辉瑞旗下全球最畅销的千亿美元药物立普妥（Lipitor）在美国本土专利保护到期，立普妥在这一全球最大销售市场的销售额下降了42%。是什么意思？

Prior to November 30, 2011, with one hundred billion U.S. dollars of Pfizer's global best-selling drug Lipitor (lipitor) in the United States patent protection expires, the decline in sales of Lipitor, the world's largest sales market 42%.

Before this the November 30, 2011, along with Pfizer, the world's best-selling drug, $100 billion, and in the United States ( ) Lipitor local patent protection expires, and the Republika Srpska and the world's largest market for the sale of a 42% decline in sales.

But before this on November 30, 2011, served under somebody's banner the global most best-selling 100,000,000,000 US dollar medicines along with splendor Switzerland to set up Pu proper (Lipitor) to expire in the US territory patent protection, sets up Pu ready to drop 42% in this global maximum sal

After a November 30, 2011, with Pfizer its billions of dollars of the world's best selling drug Lipitor (Lipitor) in United States domestic patent protection expires, Lipitor sales in the world's biggest sales market dropped by 42%.

正在翻译，请等待...