twiddle one's thumbs

例句：

1. 1.She twiddled her hair nervously before the presentation.
   在演讲前，她紧张地扭着她的头发。
2. 2.The children were twiddling with their toys in the park.
   孩子们在公园里摆弄着他们的玩具。
3. 3. The old man twiddled his cane and walked slowly towards the door.
   老人摇着他的拐杖慢慢地走向门口。