removed or distant either physically or emotionally 

politic : offend :: aloof : associate 

gregarious <> aloof

alphabetical  a.字母(表)的，ABC的 

arranged in the order of the letters of the alphabet 

dictionary : alphabetical :: annals : chronological 

altruism      n. 利他主义，不自私  

unselfish regard for or devotion to the welfare of others     

altruism <>egocentric

amalgamate    v. 合并，混合

to merge into a single body    

amalgamate <> separate/isolate

amass         v.积聚

to collect for oneself : ACCUMULATE       

ambiguous     a.模棱两可的；分歧的 

doubtful or uncertain especially from obscurity or indistinctness  

ambiguous : clarity :: mendacious : truth     

ambiguous : understand :: blatant : ignore    

equivocation:ambiguous::platitude:banal

watershed  <> ambiguity 

ambivalent    a. 矛盾的,好恶相克的

a : continual fluctuation (as between one thing and its opposite)  

b : uncertainty as to which approach to follow
ambivalent <> commitment

amble         vi. 缓行,溜蹄 

a leisurely walk  

walk : amble :: talk : chat     

ambrosial     a. 特别美味的 

something extremely pleasing to taste or smell   

mellifluous : music :: ambrosial : food