787.symptom (n.) 征候，前兆
All this activity，many scientists speculate，may be a symptom that overall tectonic pressure in the region is increasing.（TIME，Jan．31，1994，p. 45）
许多科学家推测，这一切活动可能是加诸此地区地壳整体压力逐渐增强的征兆。
注：speculate (v.)推测；tectonic (a.)地壳构造上的
788.threshold (n.) （事物的）开端
Those who will really pay for the fiasco are Mexico's emerging middle class，who had come to believe they were finally on the threshold of prosperity.（TIME，Mar. 6，1995，P．34）
真正得为这场经济危机付出代价的是墨西哥正在崛起的中产阶级，这批人先前一直以为他们终于要富起来了。
(n.) 门槛限制，税的起征点
Through a long chain of intermediary companies，Murdoch’s Australia-based News Corp．would own the remaining 24﹪of the voting stock，just under the federal threshold.(Apr. 17，1995，P．45)
通过一系列中介公司，默多克以澳大利亚为大本营的新闻公司，将取得剩下的24﹪有投票权的股权，此一比例刚好贴近联邦对此的门槛限制（25﹪）。
789.transaction(n.)交易，买卖
The company's CyberCoin system will allow online “micro-transactions”, of as little as a quarter．（TIME，Oct．7，1996，P．40）
这家公司的“网络硬币”系统能让网络进行低至0.25元的“微量交易”。
790.transmission (n.)传递
After doctors determined that AZT could block the transmission of HIV to the fetus in some pregnant women，researchers wondered if they could make the therapy more effective．（July 8，1996，p．39）
医生确定AZT用于某些孕妇身上，可以隔绝艾滋病毒不传染给胎儿；于是研究人员就想法子看能不能加强这种疗法的效果。
注：block (v.)围堵，阻挡；fetus (n.) 胎儿
791.treason(n.)叛国（罪）
He was sentenced to 15 years for high treason. （May.22, 1995. p.56）他因严重叛国罪判刑15年。
792.upheaval (n.) （社会等的）大变动，动乱
Or are they a precursor of the kind of climactic upheavals that can be expected from the global warming caused by the continued buildup of CO2 and the other so-called green-house gases？（TIME，July8，1996，P.40）
或者说那是某种气候剧变的前兆，而这种剧变可预测源自不断增加的二氧化碳及其他所谓的温室气体所引起的全球性温度上升。
注：buildup (n.) 逐渐增加
793.velocity (n.) 速度
The Heisenberg Uncertainty Principle states that you cannot know a subatomic particle's exact position and its exact direction and velocity at the same time．（TIME，Nov. 28，1994，p. 78）
根据海森堡不确定原则，你无法同时知道亚原子粒子的确切位置及其确切方向和速度。
794.venture (n.) 冒险的活动，有风险的事业 (v.)冒险前去
No fan of the United Nations，Dole opposes U.S. participation in U．N．peacekeeping ventures and in nation-building exercises in third-tier countries like Haiti and Somalia．（July 8，1996，P．29）
多尔对联合国没好感，反对美国参与联合国维持和平的冒险行动，或第三世界国家，如海地和索马里，的建国活动。
注：tier (n.) 层
795.visionary (n.) 有远见的人
The steadfast visionary who began his career by bringing land reform to his island had started to win more equal ground for Taiwan in the world's eyes. (TIME，Dec.25，1995 / Jan. 1，1996，p. 54)
这位以实行土地改革开始其政治生涯的坚定理想家，已经开始在世人的目光下为台湾赢得更公平的地位。
796.watershed (n.) 转捩点，开启新发展的关键
[同]turning point
In a watershed decision，the U.S. Supreme Court sharply restricted the ability of the Federal Government to fashion affirmative-action programs．(TIME，June 26，1995，p．23)
美国最高法院作出一项划时代的判决，明确限制联邦政府在制定鼓励雇用少数民族、妇女的赞助性措施方面的权力。
注：fashion (v.)制造；affirmative-action 鼓励雇用少数民族、妇女的赞助性措施
797.windfall (n.) 意外之财
Kazakhstan President Nursultan Nazarbayev visited Washington last week and came away with a windfall of＄311 million…（TIME，Feb. 28，1994，p. 13）
哈萨克斯坦总统纳札尔巴耶夫上周访问华盛顿，并带着3.11亿美元的意外收获离开。