美國ARCO 權威托福參考詞匯：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.預兆的, 惡兆的 being or exhibiting an omen : PORTENTOUS;
on the spot
adv.當場, 在危險中, 處于負責地位
operation
n.運轉, 操作, 實施, 作用, 業(yè)務, 工作, 手術
option
n.選項, 選擇權 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, 覆沒 to cover over completely : SUBMERGE 顛覆，推翻UPSET, OVERTHROW