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n (1)(傳播，表達(dá)的)手段(方法)媒介(way or means for sending information or expressing sth)[C]：the broadcasting/the advertising～廣播/廣告手段;news/mass media 新聞/大眾傳播媒介;Television is an important～for amusing people/giving information/teaching foreign languages/advertising.電視是娛樂(lè)觀眾/傳播信息/教授外語(yǔ)/廣告宣傳的重要媒介。English as a～of instruction英語(yǔ)作為教學(xué)用語(yǔ);sculpture as a～of artistic expression 作為藝術(shù)表現(xiàn)手段的雕刻;money as a～of exchange作為交換手段的貨幣;the～of lithography/print/the press 平板印刷/出版/新聞手段;As his literary～he has chosen a biographical form.他選擇傳記體作為他的文學(xué)表現(xiàn)手段。They told the story through the～of dance.他們借助于舞蹈的形式講述這個(gè)故事。〖同〗means，way，mode，form;

(2)媒(介)質(zhì)，環(huán)境(substance or surroundings for carrying or sending)[C]：Copper is a good～for conducting heat.銅是熱的良導(dǎo)體。Air is a good～for sound. 空氣是聲音的良導(dǎo)體。Most bacteria grow best in a light acid～.大部分細(xì)菌在弱酸環(huán)境中生長(zhǎng)最快。Fish live in an aqueous～.魚(yú)在水中生存。

(3)中間(等，庸)(positive，condition or course of action midway between extremes)[C]：Their price is the～.他們的價(jià)格適中。a～between good and bad;好與壞的中間狀態(tài);The agreement is a～between their wishes and ours.這協(xié)議調(diào)和了他們與我們雙方的愿望。Sometimes it's difficult to find a happy～between extravagance and meanness/severity and leniency.有時(shí)很難在奢華與吝嗇/寬與嚴(yán)之間找到中庸之道?！纪絚ompromise，moderation;〖反〗extreme;

adj 中間(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/長(zhǎng)度;～heat/temperature適中熱量/溫度;～red/brown/blue中紅/棕/藍(lán)色;a～-priced car價(jià)格中等的汽車(chē);a～-sized book大小適中的書(shū);low，～，and high speeds低、中、高速;Would you like the small，～or large packet? 大、中、小包你喜歡哪一個(gè)?～wave中波;〖同〗average;〖反〗extreme，unusual，unreasonable