busy oneself in

例句：

1. 1. She isbusy oneself in preparing for the party.
   她忙着为聚会做准备。
2. 2. Hewas busy oneself inwriting his report.
   他忙着写他的报告。
3. 3. The children were busy oneself in playing games.
   孩子们忙着玩游戏。