expectancy
n. 期望；預期；（根據(jù)概率統(tǒng)計求得的）預期數(shù)額

life expectancy
預期壽命

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；份額

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

biotechnology
n. 生物工藝學（把工藝技術(shù)應用于生物科學，如生物工程）

*breakthrough
n. 突破；突破性進展；重大成就，關(guān)鍵問題的解決

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

sophisticated
a. 1. refined and advanced 高級的，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 幫助，幫忙

*muscular
a. 1. 肌肉的
2. 肌肉發(fā)達的，強健的

deterioration
n. 退化；惡化；變壞

*deteriorate
vi. become worse 變壞；惡化；退化

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

integrate
vt. (with, into) combine (parts) into a whole 使結(jié)合；使成一體

network
n. 1. a large system of lines, tubes, wires, etc. that cross or meet one another 網(wǎng)狀系統(tǒng)
2. 廣播網(wǎng)；電視網(wǎng)；廣播（或電視）聯(lián)播公司

superhighway
n. 超級（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 （市鎮(zhèn)的）居住的，住宅區(qū)的

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

*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，終點

space-plane
n. 宇宙飛機

colonize, -ise
vt. 在…開拓殖民地

frontier
n. 邊境，邊界；邊疆（the～）（美）（靠近未開發(fā)地帶的）開發(fā)地區(qū)邊緣；邊遠地區(qū)

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、飛機、車）上，上（船、飛機、車）

spacecraft
n. a vehicle able to travel in space 宇宙飛船

boom
n. (a period of) sudden growth or prosperity 迅速發(fā)展（期）；繁榮（期）

*assert
vt. 1. state or declare forcefully and clearly 斷言；堅持說；宣稱
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 所有權(quán)

*productivity
n. the rate or efficiency of producing; the ability to produce things生產(chǎn)率；生產(chǎn)力

fantastic
a. 1. wonderful, great 了不起的，極好的
2. extraordinary 異乎尋常的
3. (of an idea, plan, etc.) too unrealistic to be practical or reasonable 幻想的，異想天開的

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