learn by heart 記??；默記；背誦learn and live 活到老學(xué)到老；學(xué)無(wú)止境learn about 了解；學(xué)習(xí)learn a lesson from 從……中吸取教訓(xùn) 引以爲(wèi)戒learn a lesson 受到教訓(xùn)learn (v.) learn vt.& vi.學(xué)習(xí)，學(xué)會(huì)vt.記住vi.學(xué)習(xí)learer n.學(xué)習(xí)者；初學(xué)者leapyear 閏年leapt 動(dòng)詞leap的過(guò)去式和過(guò)去分詞leaps and bounds 跳躍；飛速地leaps n. 跳躍，劇增，急變（leap的複數(shù)） v. 跳躍；急速進(jìn)步（leap的三單形式）leapingorgan 跳躍器leapingly adv.跳躍地；用於跳躍地leaping-ill [毉] 羊跳躍病leaping blenny leaping n.跳躍；閏年出生的嬰兒adj.跳躍的；跳躍而行的動(dòng)詞leap的現(xiàn)在分詞形式leapfrogs n.跳背遊戯(遊戯者輪流從其他彎背人身上跳過(guò))v.跳背；越級(jí)提陞leapfroging 間斷勘探leapfrogging 間斷勘探,交互躍進(jìn)