“警觉的”用英语怎么说？

他带着怀疑和警觉的眼光看待这些事件。He viewed the proceedings with doubt and alarm.高山鲑鱼是一种警觉的, 智慧的动物.The mountain trout is an alert, intelligent creature.发生这麽大的意外而大难不死是让人警觉的经验.Surviving such a serious accident is really a sobering experie...