At the beginning of each semester, Yu sends carefully written letters to his children's teachers telling them what went on over the break, what his kids know how to do, and what they have yet to master.
每學期開學時，游乾桂都會費心地寫一封信給孩子的老師，告訴老師孩子在寒暑假期間發生了什麼事，學會什麼，什麼還不會。