keep both eyes open

例句：

1. 1. The team needs to keep the score high.
   这个队伍需要保持高分。
2. 2. She kept her promise and visited me in hospital.
   她履行了她的承诺，在医院探望了我。
3. 3. They kept a close eye on the situation.
   他们对情况保持了密切的关注。