be on the alert造句怎么写

We have been worried about the possibility of war and have had to be on the alert every year.

We are therefore campaigning for authors, researchers and editors to be on the alert for plagiarism and to work against cultural misunderstandings.

Considering the fact that the patient's heart,lungs,kidneys and Brain functions have remained poor, one should be on the alert for an accident that might recur at any time.

Every country that advocates peace must be on the alert.

Police warned the public to be on the alert for suspected terrorists.

They want to be on the alert for similar buying opportunities.

When you back out of your driveway or leave your garage, be on the alert for children who are walking or bicycling to school.

Yellow - be on the alert.

Police are warning the public to be on the alert for suspicious packages.

Currently, first, the BRICs should be on the alert that hostile powers in developed countries may make mischief between them under the cover of ideology and history-made problems;

The police of Marseilles will be on the alert by land, whilst the governor pursues me by sea.

Drivers must be on the alert for traffic signals.