程序测试可以用来显示错误的存在，但永远不能显示它们的缺失！

A healthy forest is a resilient forest.

A quarry should heal the earth even as it harvests from it.

Collaboration across industries and governments is essential to tackle the global challenge of climate change.

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.