The happiest people are those who have discovered that happiness is a choice and not a result of circumstances.

"The immune system is like a double-edged sword; it can fight cancer but also needs to be controlled."

Leadership means making tough decisions today that will benefit everyone tomorrow.

Innovation requires both fundamental research and practical application.

解释：在中药中，以草本植物为主的药材占据重要地位，体现了草本植物的药用价值。