n (1)(传播，表达的)手段(方法)媒介(way or means for sending information or expressing sth)[C]：the broadcasting/the advertising～广播/广告手段;news/mass media 新闻/大众传播媒介;Television is an important～for amusing people/giving information/teaching foreign languages/advertising.电视是娱乐观众/传播信息/教授外语/广告宣传的重要媒介。English as a～of instruction英语作为教学用语;sculpture as a～of artistic expression 作为艺术表现手段的雕刻;money as a～of exchange作为交换手段的货币;the～of lithography/print/the press 平板印刷/出版/新闻手段;As his literary～he has chosen a biographical form.他选择传记体作为他的文学表现手段。They told the story through the～of dance.他们借助于舞蹈的形式讲述这个故事。〖同〗means，way，mode，form;

(2)媒(介)质，环境(substance or surroundings for carrying or sending)[C]：Copper is a good～for conducting heat.铜是热的良导体。Air is a good～for sound. 空气是声音的良导体。Most bacteria grow best in a light acid～.大部分细菌在弱酸环境中生长最快。Fish live in an aqueous～.鱼在水中生存。

(3)中间(等，庸)(positive，condition or course of action midway between extremes)[C]：Their price is the～.他们的价格适中。a～between good and bad;好与坏的中间状态;The agreement is a～between their wishes and ours.这协议调和了他们与我们双方的愿望。Sometimes it's difficult to find a happy～between extravagance and meanness/severity and leniency.有时很难在奢华与吝啬/宽与严之间找到中庸之道。〖同〗compromise，moderation;〖反〗extreme;

adj 中间(等)的(middle or average in size， quality，degree or value，etc)[通常作attrib]：a～size/height/length中等大小/高度/长度;～heat/temperature适中热量/温度;～red/brown/blue中红/棕/蓝色;a～-priced car价格中等的汽车;a～-sized book大小适中的书;low，～，and high speeds低、中、高速;Would you like the small，～or large packet? 大、中、小包你喜欢哪一个?～wave中波;〖同〗average;〖反〗extreme，unusual，unreasonable