watchful as a hawk

• 严密地注视； 警惕地监视

watchful as a hawk的用法和样例：

例句

1. Munching the apple as he was, he had an eye for all her movements.
   他虽然啃着苹果，但却很留神地监视着她的每一个动作。
2. The guerrillas kept a close watch on the movements of the enemy.
   游击队机警地监视敌人的动静。