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n (1)水龍頭，活嘴(any of several types of device for controlling the flow of liquid or gas from a pipe，container，etc)[C]：the gas～煤氣開(kāi)關(guān);hot and cold～s on a basin/a bath 洗臉盆/浴缸上的冷熱水龍頭;turn the～on/off 打開(kāi)/關(guān)上龍頭;fit a～to the beer barrel 給啤酒桶上裝一個(gè)龍頭;Don't leave the～s running. 不要讓水龍頭開(kāi)著?！?water 自來(lái)水;～-root 植物的主根;

(2)竊聽(tīng)(act or an instance of wire tapping)[C]：put a～on sb's phone 搭線竊聽(tīng)某人的電話談話;

vt (1)從……放(取)出……(get liquid from(a barrel，etc) by piercing it or opening a tap)[T+n，T+n+adv(off)，T+n+prep(from)]：～a cask of cider/a new keg of beer/the barrel of beer 取一桶蘋(píng)果酒/新取一小桶啤酒/從桶中取啤酒;～off some cider 擰開(kāi)桶的龍頭取些蘋(píng)果酒;～cider from a cask 擰開(kāi)酒桶龍頭取蘋(píng)果酒;

(2)(切割樹(shù)皮)得到……樹(shù)液，汲取樹(shù)液(get liquid from the trunk of (a tree) and collect)[T+n]：～rubber trees 割橡膠樹(shù)取膠;Sugar maples are～ped when the sap begins to flow. 當(dāng)槭糖樹(shù)所含糖液飽滿時(shí)，人們便割樹(shù)取其糖液。

(3)開(kāi)發(fā)，利用(start using (a source，supply，etc))[T+n，T+n+prep (for)]：The country (nation) must～new sources of energy/its people's best brains/vast mineral wealth. 國(guó)家必須開(kāi)發(fā)新的能源/利用國(guó)民最優(yōu)秀的智力資源/開(kāi)發(fā)大量礦物資源。new ways of～ping the skills of young people 開(kāi)發(fā)青年人技術(shù)的新途徑;～one's resources 利用自己的資源;～sb for money/a loan向某人要錢(qián)/要貸款;

(4)安裝竊聽(tīng)裝置，在電話線上接線竊聽(tīng)(attach a device to (sb's telephone wires) in order to be able to listen to their telephone conversation)[T+n]：I think/suspect that my phone is being～ped. 我認(rèn)為/懷疑有人在竊聽(tīng)我的電話。

on tap 1)(指啤酒)裝在有龍頭桶中的;取自酒桶的：beer on～可隨時(shí)取用的啤酒; 2)現(xiàn)成的，隨用隨有的：information/extra personnel on～現(xiàn)成的資料/額外人員;By the way you buy new clothes you'd think we had money on～. 你那樣隨意買(mǎi)新衣服，你以為我們的錢(qián)像水龍頭里的水一樣(源源不絕)呀。