I hope you would conduct yourself well and play a constructive role in the future of the Chinese and American people and in world peace and stability. (Reuters)
I hope you will take good care of yourself and play a constructive role for the future of the Chinese and American peoples and for world peace and stability. (Newsweek)
“take good care of yourself”听上去有点“暖”,好似朋友之间的问候,无论是语义还是语调都远远偏离了原文。