| 1. | Her fears had always been on the alert for an upheaval .
她日夜提心吊胆，严防突变。 |
| 2. | Troops are on the alert against any possible aggression
军队戒备着可能的来犯。 |
| 3. | The public should be on the alert during thunderstorms
市民对雷暴必须提高警觉。 |
| 4. | Troops are on the alert against any possible aggression
军队戒备着可能的来犯 |
| 5. | Police warned the public to be on the alert for suspected terrorists
警方警告群众警惕涉嫌的恐怖分子 |
| 6. | Police warned the public to be on the alert for suspected terrorists
警方警告群众警惕涉嫌的恐怖分子 |
| 7. | " be on the alert then , for you do not know the day nor the hour
太25 : 13所以你们要儆醒、因为那日子、那时辰、你们不知道。 |
| 8. | At midnight the sentinel gave the alarm , and in an instant all were on the alert
半夜里，哨兵发出警告，全体立刻戒备起来。 |
| 9. | Scientists then can train people who fall often how to be on the alert
然后，科学家就能告诉那些经常摔倒的人该怎样小心提防。 |
| 10. | It s tough , but we will be on the alert and shall continue to do our very best
前路崎岖，但我们将会提高警惕，继续悉力以赴。 |
