我不认为你需要悲伤才能写出一首悲伤的歌。
Food security begins with soil security.
One solution fits all is not the way to go.All these cultures are different.The right culture for the Mayo Clinic is different from the right culture at a Hollywood movie studio.You can't run all these places with a cookie-cutter solution.
The goal of mathematics is to understand the universe in a deeper way.