171.engage v. 从事于
Like so many promising HIV treatments, Ho’s strategy could fail. It could even backfire if it is mistakenly touted as a kind of “morning after” treatment that allows people to relax their guard and engage in risky sexual behavior.
172.enhance v. 增强
In the largest study, almost 40% of those who took the placebo reported enhanced sexual function.
注： placebo n. 指不具药性，但会产生心理治疗作用的药
173.ensure v. 保证（进展顺利），确保（地位）
In a controversial new book called Blindside, journalist Eamonn Fingleton argues that these firms help ensure that Japan will overtake the U.S. as the world’s leading economy by the year 2000.
注： overtake v. 超过
174.evade v. 躲过
Last December DIA (Defense Intelligence Agency) officers working through private brokers bought parts of a Russian SA-10 air-defense missile system from Belarus, a former Soviet republic. The system is being dissected to see how U.S. Air Force planes can evade radar.
注： dissect v. 肢解，详细检查
175.exceed v. 超越
Toy manufacturers pray for a product’s sales to double after the launch of TV ads and for demand to exceed supply temporarily …
176.exhibit v. 显示，显露
Infants as young as three months old exhibit empathy when they get upset at the sound of another baby crying.
177.expand v. 扩张
For his part, Yeltsin fears pressure from a NATO that is likely to expand closer to Russia’s western border.
178.explode v. 爆炸性增长
Gates in April 1994 called on off-site meeting of his top staff to talk about a technology that had been around for 20 years but had suddenly exploded.
179.fascinate v. 使着迷
Young, who is fascinated by technology, has started a company that makes devices for the disabled, as well as high-tech toys.
180.file v. 提出（控诉）
In response, the cult’s leaders had its lawyers file suit.