派生词是alertness，名词词性，意思是警惕，例如：

1.The presence of non-task-oriented ideas is a sign of broad interest, concern, and alertness on the part of the employees.一些非有关部门工作的建议的产生，标志了在部分职工中的广泛兴趣、机智和关心企业的精神素质。

2.She also said the alertness will change according to the level of potential threat.她也说，警戒将随时根据受威胁的水平而调整。

3.Produces changes in brain activity associated with decreased alertness;影响中枢活动，警觉能力下降；。