keep oneself close

例句：

1. 1. We need to keep the windows closed to prevent the cold air from entering.
   我们需要关紧窗户，以防冷空气进入。
2. 2. The team needs to keep working hard to achieve their goals.
   团队需要继续努力工作以实现他们的目标。
3. 3. She kept her promise to help me with my homework.
   她遵守了她的承诺，帮助我完成家庭作业。