Unit3b Entering a market

pledge: n. 1、a serious promise;2、a sum of money or sth valuable that you leave with sb to prove that you will do sth or pay back money that you owe;v. to formally promise to give or do sth;

aviation: n. the designing, building and flying of aircraft;

rarity:n. a person or thing that is unusual and is therefore often valuable or interesting;

pledged investment：合同投资，允诺投资

strength：n.强项，优势

literature：n. 印刷广告，产品宣传资料

advisable：adj.最好的

dead tree：纸质的

imperative：adj.极其重要的，必要的，命令式的

discourteous：adj. 不礼貌的，失礼的，粗鲁的

small talk：闲聊

audio-visual aids：视听设备，视听教具

verbal agreement：口头约定，口头协议

pasta：n.意大利面食

alternatively：adv.或者