U 開頭單詞
undertide n.暗流；潛流
underthrust adj.[地]頫沖斷層的n.[地]頫沖斷層
underthroating 簷坡滴水凹圓線
underthings [複] n.；(女子的)內(nèi)衣褲
underthecounter adj.私下出售的(違法的)
undertenant n.轉(zhuǎn)租的承租人
undertax v.課稅太低
undertakings n.事業(yè)（undertaking的複數(shù)形式）；擔(dān)保，保証；承諾
undertaking-starting 創(chuàng)業(yè)
undertaking simultaneous interpretation 同聲傳譯
undertaking prospectus [經(jīng)濟學(xué)]創(chuàng)業(yè)計劃書
undertaking business [經(jīng)濟學(xué)]創(chuàng)業(yè)
undertaking n. 事業(yè)；企業(yè)；保証；殯儀業(yè) v. 同意；擔(dān)任；許諾（undertake的ing形式）
undertakes v.承擔(dān)；從事；保証；答應(yīng)
undertaker n. 承擔(dān)者；承辦人；殯儀業(yè)者
undertaken v.接手；從事動詞undertake的過去分詞.
undertake work 承擔(dān)工作