美國(guó)ARCO 權(quán)威托福參考詞匯：O字頭

O

oath

n.誓言, 宣誓, 詛咒 a solemn attestation of the truth or inviolability of one’s words

obstacle

n.障礙, 妨害物 something that impedes progress or achievement

ominous

adj.預(yù)兆的, 惡兆的 being or exhibiting an omen : PORTENTOUS;

on the spot

adv.當(dāng)場(chǎng), 在危險(xiǎn)中, 處于負(fù)責(zé)地位

operation

n.運(yùn)轉(zhuǎn), 操作, 實(shí)施, 作用, 業(yè)務(wù), 工作, 手術(shù) 

option

n.選項(xiàng), 選擇權(quán) the power or right to choose : freedom of choice

outlawe

n.歹徒a lawless person or a fugitive from the law

逃犯 a person excluded from the benefit or protection of the law

v. 宣布...為不合法to deprive of the benefit and protection of law : declare to be an outlaw

overlap

v.(與...)交迭 to extend over or past and cover a part of

overwhelm

vt.淹沒(méi), 覆沒(méi) to cover over completely : SUBMERGE 顛覆，推翻UPSET, OVERTHROW