| 1. | The spirited competition kept them on their toes .
激烈的竞争使他们保持警觉。 |
| 2. | One of them seemed especially close to master
在师父旁边，真的要时时保持警觉。 |
| 3. | We should be on alert for anything suspicious
我们必须对任何可疑的事情保持警觉 |
| 4. | Public urged to remain vigilant against dengue fever
市民须保持警觉预防登革热 |
| 5. | But be aware that it can , and it probably will
但随时保持警觉，很可能会有事发生 |
| 6. | The strong competition keeps us on our toes
这个强大的竞争者使我们保持警觉。 |
| 7. | Stay on guard against dengue fever and je
市民应保持警觉预防登革热及日本脑炎 |
| 8. | She is always on the alert for some new calamity
她总是保持警觉以防某种新的灾难。 |
| 9. | She was always on the alert for some new calamities
她总是保持警觉以防某种新的灾难。 |
