Her expression was watchful and alert.
她露出一副察言观色、处处提防的表情。
Signs posted along the hallway walls tell people to be alert to possible gas poisoning and to be watchful of electric blankets and other fire hazards.
在走廊墙上贴着告示，提醒大家警惕煤气中毒，注意电热毯和其他火灾隐患。
They are discovering, the scientists, and those who are concerned with babies and children, that babies are very alert, learn, watchful.
他们发现，科学家们和那些关注婴儿和孩子们的人，发现婴儿是十分机敏的，学习，警觉。
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