wander from the subject

例句：

1. 1.The children were wandering in the park.
   孩子们在公园里闲逛。
2. 2. He wandered aimlessly through the streets.
   他漫无目的地在街上闲逛。
3. 3. She wandered around the house looking for her lost keys.
   她在家里到处寻找她的丢失的钥匙。