seat的用法比较特殊．当动词时有两种用法：
1．be seated. 例：they are seated there. 他们坐在那．
2．seat oneself. 例：they seat themselves there. 他们坐在那．
像dress这个单词它的用法也是be dressed . Iamdressed in a white coat
I dressmyself in a white coat