261.tap v. 轻按（电脑键）
A motorist lost in the San Fernando Valley can tap into GPS and get an instant position on the digitized map.
若在圣福尔南多峡谷驾车迷路，只要按键进入全球定位系统，就可立即在数字化地图上找出自己的位置。
262.testify v. 作证
I may sound clinical and unemotional when I testify about these operations, but it does not reflect my true feelings…
当我为这些行动作证时，人们可能觉得我客观又冷静，但那并非我内心真正的感受。
注： clinical adj. 冷静的，客观的
263.threaten v. 扬言，放话
Under the proposed reforms, … anyone’s neighbor could threaten to convert his land into a toxic-waste dump and claim compensation from the government if he was not allowed to do it.
按照已提出的改革方案，任何人的邻居都可能放话要将自己的土地变为有毒废物的弃置场，政府若不准他这么做，就向政府索赔。
注： claim v. 要求，索讨
264.tolerate v. 容忍
【同】put up with
American capitalism likes entrepreneurs to have a gleam in their eye, and even tolerates some clawing and scratching as long as the playing field is level and the fight is fair.
美国资本主义喜欢企业家野心勃勃，甚至容忍彼此激烈竞争，只要一切竞争合乎公平原则。
注： a gleam in one’s eye 尚未形成的想法；claw v. （用爪）抓；scratch v. 抓
265.track v. 追踪
Still other sensors (in smart cars) will track and record the wear on parts and systems, alerting the driver to potential trouble, and will even flash warning when pressure in the tires is too low.
另外，（智慧汽车上的）其他传感器会追踪并记录零件与系统地磨损情形，借此提醒驾驶人防备潜在的危机，胎压过低时，这些传感器甚至会闪灯警示。
266.transcend v. 超越
But because she is an African-American woman, her importance to and impact on her times transcend the literary.
但因为她是非裔美国人，又是女性，她在当时的重要性及影响力，超越了文学的范围。
267.transfer v. 转移，转账，转变
The software acts like an ATM, allowing you to transfer $20 to $100 from your bank into your (electronic) wallet before heading off onto the Web.
这套软件的功能类似自动提款机，让你在上网采购之前先从自己的银行账户转帐20至100美元到电子皮夹里。
268.transform v. 改变
They would more radically transform the system by ending the income tax entirely and by shifting to taxes on consumption.
他们改革体制的作法更为激进，一方面整个废除所得税，一方面将税收来源转到消费上。
269.undergo v. 接受（检查、手术等），经历(underwent, undergone)
【同】 go through
Foreigners who intend to spend more than three months in Russia must now undergo mandatory testing to prove they are not infected with HIV…
外国人凡欲在俄国境内居留超过3个月，都必须接受强制性检测，以确定是否染上艾滋病毒。
注： mandatory adj. 强制的
270.undermine v. 损坏，破坏
The prosecution opened its murder case against O.J. Simpson by presenting witnesses and evidence intended to undermine his public image as a genial ex-jock with a portrait of a jealous wife abuser.
检方一开始就提出人证、物证，起诉辛普森杀人；并且有意通过这些人证、物证，破坏之前这位前运动员亲切和善的公众形象，代之以满怀妒意、虐待老婆的形象。
注： genial adj. 亲切的、友善的；jock n. 运动员