The kids were always making fun of him behind his back. 孩子们背地里总是拿他开玩笑。

He prefers to work behind the scenes as a director. 他更愿意作为导演在幕后工作。

in some dark corner of his mind 在他头脑中的某个神秘角落

an incalculable risk 难以预料的风险

a nuclear accident with inconceivable consequences 后果无法想象的核事故

a man of indeterminate age 年纪不确定的男人

She has that intangible quality that a player must possess to be a champion. 她具有冠军运动员所必备的那种无法形容的素质。

Jo does the publicity work, while Ed stays very much in the background. 乔做宣传工作，而埃德则主要做幕后工作。

Many minority groups are invisible on the major American television networks. 许多少数群体在美国的主流电视网上受到忽视。

Why this approach failed, we can only guess. 我们只能猜测这种方法失败的原因。

Little did I realize I would one day be in charge of the office. 我没有意识到我有一天也会成为办公室主管。

a mystery caller 神秘的来访者

Steve needs to prove that there is more to him than meets the eye.

There's no saying what they might be capable of achieving. 很难说他们可能会取得什么成就。

His contribution to contemporary music was largely unacknowledged. 他对当代音乐的贡献在很大程度上没有得到认可。

Dreams often contain unacknowledged fears and anxieties. 梦中常常出现被忽视了的恐惧和焦虑。

The company was sold for an undisclosed sum. 公司被卖掉了，卖多少钱没有公开。

an unexplained death 原因不明的死亡

an unexplored cave 未经勘探的洞穴

Her ideas went unheard yet again. 她的想法再次无人理会。

All of her suggestions had gone unheeded. 她的所有建议均未引起注意。

an unidentified gunman/person/body 身份不明的持枪歹徒/身份不明的人/无名尸体

Unknown to the MP, his secretary had already spoken to reporters. 这位议员还不知道，他的秘书已跟记者说了。

an unmarked police car 没有标志的警车

Doctors have identified a previously unrecognized form of the disease. 医生已识别出了一种过去不知道的疾病。

Their arrival went largely unremarked. 他们的到来未曾引起多大关注。

unseen forces/troops/enemies 未被发现的部队/军队/敌人

She owes a large but unspecified amount of money. 她欠了一大笔钱，但具体数目不知道。

A previously unsuspected kidney disease caused her death. 一种前所未闻的肾病导致了她的死亡。

I don't know what these kids get up to when my back is turned.