1978年，中国开始实施改革开放，这是一次彻底改变国家面貌的历史性变革。40多年过去了，回头看，改革开放到底改变了什么，又带来了哪些开放的机会？

The 1978 cold case murder of California high school teacher Diane Peterson, who was stabbed to death, has been solved this ...