英 [əˈlɜːtnəs] 美 [əˈlɜːrtnəs]
n. 警戒；机敏
the process of paying close and continuous attention
同义词： watchfulness / wakefulness / vigilance
a state of readiness to respond
同义词： alerting
lively attentiveness
同义词： sharp-sightedness / on the qui vive
警觉
警觉（Alertness）（Ex）： 当魔宠在主人身旁时，主人获得警觉专长。
机敏（Alertness）：自动寻找场景中的关键道具 魔法强化（Magic Affinity）：增加魔法值的最大上限
警戒（Alertness）：在整个取食或贮藏行为过程中都可能出现的站立并翘首不动或四处张望，或当有 同种竞争者侵入时表现出的吼叫声、驱赶追逐甚至撕打...
... snap out of it 从…迅速恢复过来 alertness 清醒 glaze 发呆，(眼神)变呆滞 ...
Alcohol causes a loss of judgment and alertness.
酒精会使人丧失判断力和警觉性。
The drug improved mental alertness.
这种药物提高了大脑的灵敏度。
A short nap can promote alertness and improve performance, which are important when you are at work.
小睡一会儿可以提高机警性，提高工作表现，这在你工作时是很重要的。
"I can say that,anecdotally, virtually all the teachers noticed immediately much more alertness in class, definitely more positive mood.
VOA : special.2010.10.07
Finally, avoid over-the-counter "alertness aids" like NoDoz and Vivarin, which are overloaded with caffeine.
Toulon held firm though and were soon back in the ascendancy thanks to Wilkinson's alertness.
The "controlled rest" is legal and an accepted procedure in order to improve on-the-job performance and alertness.