The very important thing you should have is patience.
Sometimes the hardest thing and the right thing are the same.
Coal isn't the problem - how we use it is. The solution lies in cleaner technologies and better utilization.
艺术的恐怖之处在于你不知道它会把你带向何方。
实际发展水平与潜在发展水平之间的距离,前者由独立解决问题决定,后者由在成人指导下或与更有能力的同伴合作解决问题决定。