jail
n. prison 监狱
jeopardize
v. cause (sth) to be harmed， lost or destroyed； put in danger 使（某事物）受到伤害、损失或破坏；使陷于险境
jeopardize one s life 危及生命/jeopardize one s future 危及某人的前途/jeopardize relations between the two countries 损害两国之间的关系/seriously jeopardize 严重危害
The security of the whole operation has been jeopardized by one careless person.
整个作业的安全让一个粗心大意的人给破坏了。
jerk
ｖ. to move with a jerk or jerks 猛扯，猛推 to speak sth. with difficulty in quick bursts 猛然一动 n. a short quick strong pull 急推，急拉 a short quick movement 震摇
jerk指猛然开始，猛地终止的快速动作，尤指粗野、有力、陡然的动作。如：shut the drawer with a jerk(猛地关上抽屉)；jerk off the blanket(猝然甩去毯子)。
in a jerk 立即，马上
As the water was unexpectedly hot， he jerked his hand out.
因为水出乎意料地热，他急抽出他的手。
journalist
n. person whose profession is journalism 新闻工作者；新闻记者；报人；（报纸杂志的）撰稿人
He s a journalist on the “Daily telegraph”.
他是《每日电讯报》的记者。
juncture
n. a place where two things are joined；a junction or joint 接合点 a point in time， esp. a critical point 关键时刻，危急关头
Going to university is an important juncture in my life.
上大学是我人生历程中的重要关头。
jury
ｎ. the person chosen to sit in a court of law and decide whether what is said is true 陪审团； (竞争或展览的)评判委员会
强调陪审员中各成员时，用单数表示复数含义，谓语也用复数。
justification
n. (for sth/doing sth) acceptable reason (for doing sth) 做某事的正当理由
sufficient justification 充分的理由/moral justification 道义上的理由/justification for...…… 的理由/find justification for... 为……寻找借口/in justification of 为……辩解
I can see no justification for dividing the company into smaller units.
我认为没有理由把公司划分成小单位。