将给定的英文段落翻译成中文。


Through the last half of the 20th century, a new ideal began to emerge in the West – an ideal of peace and cooperation between nations. This ideal was born out of the horrors of two world wars, and it was embodied in the development of international organizations such as the United Nations and the European Union. Today, that ideal is under threat. Many countries are turning inward, focusing on their own narrow interests, and abandoning the principles of cooperation and mutual benefit that have helped to sustain relative peace and prosperity in the world for more than 70 years.
在20世纪的后半叶，一个新的理想开始在西方崛起——国家间和平与合作的理想。这个理想诞生于两次世界大战的恐怖之中，并体现在国际组织的发展上，如联合国和欧洲联盟等。今天，这个理想正受到威胁。许多国家正在将注意力转向内部，专注于自身的狭窄利益，抛弃合作和互利原则，这些原则有助于在世界上维持相对和平与繁荣已经70多年了。