keep head above water

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 kept their heads held high during the tough times.
   在艰难时期，队伍保持了高昂的斗志。
3. 3. She kept her promise and visited the museum on time.
   她履行了自己的承诺，按时参观了博物馆。