imperceptible
                    
      英 [ˌɪm.pəˈsep.tə.bəl]                            
                        美 [ˌɪm.pɚˈsep.tə.bəl]                    
                    
                    
                    
                 
                
             
                        
            
                1、im- "not, opposite of" + per- "thoroughly" + cept- + -ible.
2、literally "take entirely".
3、figuratively "grasp with the mind, learn, comprehend, recognize, notice".
4、如今,在英语里只使用其比喻义、引申义。            
                        
            
                imperceptible 无法感知的im-,不,非,perceptible,可感知的。
             
                        
            
                
- imperceptible (adj.)
 
- early 15c., from French imperceptible (early 15c.), from Medieval Latin imperceptibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + perceptibilis (see perceptible). Related: Imperceptibly. OED marks imperceivable as "Now rare."
 
                  
                        
            
                
- 1. Brian's hesitation was almost imperceptible. 
  - 布赖恩的犹豫几乎难以察觉。
   
- 2. imperceptible changes in temperature 
  - 难以觉察的气温变化
   
- 3. The slight change in the taste was imperceptible to most people. 
  - 这种味道的细微变化对大多数人而言是无法觉察的.
   
- 4. She answered with an almost imperceptible nod of the head. 
  - 她几乎不为人察觉地点了一下头作为回答.
   
- 5. His head moved in an almost imperceptible nod. 
  - 他点头的动作微小得几乎看不出来.