表面

surface;face;outside;appearance
他只是～上客气。His politeness was only on the surface./透过～观察事物look below (or beneath)the surface of things/只看某人的～价值take sb at face value/～上气壮如牛，实际上胆小如鼠outwardly strong as a bull but inwardly timid as a mouse/～上保持中立assume a facade of neutrality/～上接受pretend to accept/～文章pay lip service;surface formality; mere show or ostentation/～价值face value /～现象superficial phenomenon/～印象surface impressions