That is not simply because governments in developing countries are wielding the big stick of busting patents: their expanding middle classes also provide a tantalising carrot.

• 但是事情并不是那么简单的，因为一方面发展中国家的政府正在挥舞着破坏专利保护的大棒；另一方面它们迅速扩张的中产阶层却提供了跨国制药企业急需的胡萝卜。