sidedoor;便门
front[back]entrance[door];前[后]门
throttlevalve;闸门{机}
sluice;watergate;水门
key;knack;窍门
havelearnedtheropes;knowone'swayaround;getaninkling摸着点门儿了
thewholefamily;满门
Blessinghasdescendeduponthehouse.喜临门。
Buddhism;佛门
Confuciandisciples;孔门弟子
speciality;专门
knoweverysubjectorprofession;门门精通
Protozoa;原生动物门
Vertebrata脊椎动物门
ANDgate;“与”门
NOTgate“非”门
MenWen'ai门文爱
apieceofartillery;acannon;agun;一门大炮
twomortars两门迫击炮
thismarriage(proposal);这一门大炮
thisbranchofstudy;这门学问