Maybe the death. Seriously, I can undersatnd the burden of the earth that it can not earn so so many many people living. Just like the rule of nature!
I can also understand when we grow up, our grandparents and parents get older. But i can not understand why they finally leave us with a death. This’s it. I can’t understand the way that they leave us. Death means that we can’t see them anymore. With time goes by, we might not remember their kind face. That is very cruel! As we get married, we will leave our children. I just can’t imagine that scene!!! So cruel!
Although, the birth and death are normal states, i still don’t want to let them leave us forever.