aware: implies vigilance in observing or alertness in drawing inferences from what is observed: ~ of a greater number of police officers out and about.   (alret和vigil首字母av发音和aware发音相同)     out and about是非正式，表示在公共区域走动或活跃，如本例


cognizant: implies possession of special or certain knowledge as from first-hand sources: as yet, not fully ~ of all the facts.  first-hand sources第一手消息来源


conscious: implies that one is focusing one's attention on something already perceptible to the mind or senses: ~ that my heart was pounding away.   (focus one's attention集中注意力，这里表示对思想或感觉有反应)


sensible: implies direct or intuitive perception especially of intangibles or of emotional states or qualities: a doctor who was ~ of the woman's deep depression.     (direct,inuitive perception直觉感知)     表示对无形事物的感知，如本例中deep depression深度抑郁，如I am sensible of the fact that mathematics is not popular我知道数学课不受欢迎.


alive: suggests vivid awareness of or acute sensitivity to something: we were fully ~ to the momentousness of the occasion.          （vivid两个意思，除了清晰，还表示生动）


awake: implies that one has become alive to something and is on the alert: a country not ~ to the dangers of persistent inflation.


aware警觉、意识: 表示警惕警觉(vigilance,alert)地观察或推断，cognizant知道: 有知识，conscious意识: 能感知（能集中注意力于所知所感），sensible知道: 对情感或无形物的直觉，alive敏锐意识: 表示敏锐清晰的意识，awake意识到: 意识到并警觉


记忆方法: 1) 首字母ACCSAA想象重组为AS CAAC作为中国民用航空局<==有安全意识   CAAC(Civil Aviation Administration of China)是中国民用航空局的缩写
         
         2) 意识的意思是知道某事mean having knowledge of something.首字母ACCSAA想象重组为AS CAAC作为中国民用航空局<==有安全意识


         今天是元旦，祝大家新年愉快，学习进步!

                          Jason, 2018.1.1