If the dog trainer says one plus two, one of the dogs goes and brings the board with a "3" on it to the trainer.
如果驯狗师说1 + 2，其中有只狗手拿写着“3”的木板走过来交给他。
2
In January, the board of Penn South, a 15-building, limited-income co-op development with 2,820 apartments, voted to abandon a no-dog policy dating back nearly 50 years.