"Anyone who tries to keep track of what is happening in China is going to end up by wearing all the skin of his left ear from twirling around on it"

This quote by Robert Benchley is an amusing way of stating that it is impossible to stay up to date with the ever-changing events in China. It implies that the job is so difficult and overwhelming that it would be like trying to spin around in circles so quick that a person would wind up deteriorating the skin on their left ear. Benchley is recommending that it is a futile effort to attempt and stay up to date with the news in China, as it is continuously altering and progressing. He is also suggesting that the task is so challenging that it would be impossible to remain on top of it. This quote is an amusing method of communicating the idea that it is difficult to keep up with the news in China.