U 開頭單詞

undertide n.暗流；潛流

underthrust adj.[地]俯沖斷層的n.[地]俯沖斷層

underthroating 檐坡滴水凹圓線

underthings [復(fù)] 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的復(fù)數(shù)形式）；擔(dān)保，保證；承諾

undertaking-starting 創(chuàng)業(yè)

undertaking prospectus [經(jīng)濟(jì)學(xué)]創(chuàng)業(yè)計(jì)劃書

undertaking business [經(jīng)濟(jì)學(xué)]創(chuàng)業(yè)

undertaking n. 事業(yè)；企業(yè)；保證；殯儀業(yè) v. 同意；擔(dān)任；許諾（undertake的ing形式）

undertakes v.承擔(dān)；從事；保證；答應(yīng)

undertaker n. 承擔(dān)者；承辦人；殯儀業(yè)者

undertaken v.接手；從事動(dòng)詞undertake的過(guò)去分詞.

undertake work 承擔(dān)工作