hat：n.(常指带檐的)帽子；(双重的)职位，角色(尤指官职或职业角色)；
cap：n.(尤指男用有帽舌的)便帽，制服帽；软帽；(大学师生在特别场合戴的)方帽
The party has shed its cloth cap image.
这个政党已经摆脱纯工人阶级的形象。
The mountains in the background were capped with snow.
远处的山峦白雪覆盖。
She screwed the cap back on the jar.
她又把广口瓶的盖子拧上。
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