He constantly immersed himself in studying how to apply economic theory to practical problems. Often Mrs. Yu would have liked to ask for some help changing a diaper, but then didn't have the heart to disturb Mr. Yu; so she ended up shouldering the entire responsibility herself.
他也無時無刻不在埋頭研究把經濟理念落實在應用的問題上，往往夫人想喊他替孩子換一塊尿布，又不忍心打擾他，只得自己一手包辦。