(informal)(of a plan or pattern or behaviour) no longer exist; disappear
(非正式)（计划，模式，行为）不再存在，消失
a favourable opportunity for doing something that must be seized immediately if it is not to be missed
有利时机，最佳时机
an opportunity to attack something that is at risk (especially as a cold war claim that America's land-based missiles were easy targets for a Soviet first strike)
脆弱之时（尤指冷战时期，美国的陆基导弹很容易成为苏联首次攻击目标的论点）
organs of sense, especially the eyes
心灵之窗（尤指眼睛）