expectancy
n. 期望；预期；（根据概率统计求得的）预期数额

life expectancy
预期寿命

proportion
n. 1. (of) the relative amounts, sizes, etc., of two or more things 比例，比
2. (of) a part or share of a whole 部分；份额

proportional
1. (of) in proportion 成比例的
2. concerning proportion 比例（上）的

biotechnology
n. 生物工艺学（把工艺技术应用于生物科学，如生物工程）

*breakthrough
n. 突破；突破性进展；重大成就，关键问题的解决

enable
vt. make able; make possible 使能够，使可能

sophisticated
a. 1. refined and advanced 高级的，尖端的
2. having or showing a lot of experience of the world and social situations 老于世故的

assist
V. (in, with) help 帮助，帮忙

*muscular
a. 1. 肌肉的
2. 肌肉发达的，强健的

deterioration
n. 退化；恶化；变坏

*deteriorate
vi. become worse 变坏；恶化；退化

retirement
n. the condition of stopping working because of old age 退休，退职

integrate
vt. (with, into) combine (parts) into a whole 使结合；使成一体

network
n. 1. a large system of lines, tubes, wires, etc. that cross or meet one another 网状系统
2. 广播网；电视网；广播（或电视）联播公司

superhighway
n. 超级（高速）公路

tunnel
n. 隧道，地道

resident
n. a person who lives (in a place) and is not just a visitor 居民

*residential
a. (of part of a town) consisting of private houses, without offices or factories （市镇的）居住的，住宅区的

residence
n. the place where one lives; a house, esp. a large important one 住所；住宅；公馆

*reside
vi. to have one's home 居住

destination
n. a place to which sb. or sth. is going or is being sent 目的地，终点

space-plane
n. 宇宙飞机

colonize, -ise
vt. 在…开拓殖民地

frontier
n. 边境，边界；边疆（the～）（美）（靠近未开发地带的）开发地区边缘；边远地区

settlement
n. 1. 定居；移民，殖民
2. 殖民地；居留地

permanent
a. lasting for a long time or forever 持久的；永久的

aboard
prep. on or into (a ship, aircraft, train, bus, etc.) 在（船、飞机、车）上，上（船、飞机、车）

spacecraft
n. a vehicle able to travel in space 宇宙飞船

boom
n. (a period of) sudden growth or prosperity 迅速发展（期）；繁荣（期）

*assert
vt. 1. state or declare forcefully and clearly 断言；坚持说；宣称
2. show, esp. forcefully, the existence of 有力地表明；明示

ownership
n. the right of having sth. as one's property 所有权

*productivity
n. the rate or efficiency of producing; the ability to produce things生产率；生产力

fantastic
a. 1. wonderful, great 了不起的，极好的
2. extraordinary 异乎寻常的
3. (of an idea, plan, etc.) too unrealistic to be practical or reasonable 幻想的，异想天开的

fantasy
n. imagination; sth. one imagines but is unlikely to happen 想象；幻想；想象的事物