adj.注意的，警惕的，提防的

We must be watchful of our health.
我们必须注意我们的健康。
Eric's mother kept a watchful eye on him.
埃里克母亲特别留心他。
You should be watchful of computer viruses.
你们应该警惕计算机病毒。
The watchful security guard noticed the suspicious behavior immediately.
警觉的保安立即注意到了可疑的行为。
A watchful parent is always aware of their child's whereabouts.
照顾周到的父母总是知道孩子的行踪。
The teacher kept a watchful eye on the students during the exam to prevent cheating.
考试期间，老师保持警惕，密切注视着学生以防作弊。
The wildlife photographer had to be patient and watchful to capture the perfect moment.
野生动物摄影师需要耐心和警觉，以便捕捉到完美的瞬间。
In the forest, hikers must remain watchful for signs of dangerous animals.
在森林中，徒步者必须保持警惕，留意危险动物的迹象。
The nurse was watchful for any changes in the patient's condition throughout the night.
护士整夜都警惕着病人状况的任何变化。
A watchful driver can anticipate and avoid potential road hazards.
一个警觉的司机能够预见到并避免潜在的道路危险。
The coach was watchful during practice, correcting techniques and offering encouragement.
教练在训练时十分注意，纠正技巧并给予鼓励。
A watchful neighbor noticed smoke coming from the house and called the fire department.
一位警惕的邻居注意到房子冒烟，随即拨打了消防部门的电话。
As a night guard, it's crucial to be watchful and attentive to your surroundings.
作为夜班守卫，对周围环境保持警惕和专注至关重要。