短语词组短语forced -draft fan 鼓风扇;鼓风机;送风机forced d draft condenser 强制通风式冷凝器stratified forced -draft 分层送风forced d draft fan 强制通风风扇;鼓风机forced air draft oven 强制通风炉forced d draft blower 强制通风鼓风机 返回 forced draft