1、unit21.astronaut/strnt/n.宇航员2.gravity/rvti/n.重力；严重性；严肃3.absence/bsns/n.缺席 absent adj.缺席的absence of mind 心不在焉 be absent from.缺席.absence from.4.float/flt/v.漂浮5.cupboard/kbd/n.壁橱6.ceiling/sil/n.天花板;上限7.bother/b(r)/v.使烦恼 bother to do/doing sth.费心做某事bother sb.with sth.因某事麻烦某人 8.occupy/kjupa/v.占用 occupy o
2、neself with sth./in doing sth.忙于某事be occupied with/in doing sth.忙于某事9.mission/mn/n.任务10.evaluate/vljuet/v.评估 evaluation n.evaluate sb.on.根据.评价某人11.creature/krit(r)/n.动物；人12.mosquito/mskit/n.蚊子13.microscope/makrskp/n.显微镜14.cast new light on 使进一步了解15.maintenance/mentnns/n.维护 maintain v.维护16.circumstan
3、ce/srkmstns/n.条件 in/under the circumstances 在这种情况下 in/under no circumstances 决不（句首倒装）17.exposure/ksp(r)/n.面临;揭露 be exposed to sth.使面临 expose sb.to sth.暴露于.18.radiation/redien/.辐射 radiate v.辐射19.visible/vzbl/adj.看得见的 be highly/clearly visible to sb 对某人来说清晰可见20.in view of 鉴于，考虑到 given/considering in o
4、nes view 在某人看来 21.luxury/lkri/n.奢侈品 luxurious/lris/adj.奢侈的22.tube/tjub/n.管子23.furthermore/fm(r)/adv.此外more over/besides/in addition/additionally 24.pill/pl/n.药片 take pills 吃药25.vital/vatl/adj.必不可少的 be vital to sb It is vital that.(that 从句谓语用should do 形式)26.discipline/dspln/v.严格要求自己；惩罚 n.训练；行为准则；自制力
5、self-discipline 自律27.leisure/le(r)/n.闲暇 leisurely adv.从容地/adj.悠闲的28.crew/kru/n.全体工作人员29.permanent/pmnnt/adj.永久的 temporary adj.短暂的30.altogether/lte(r)/adv.完全，总共31.kit/kt/n.成套设备32.telescope/telskp/n.望远镜33.universe/junvs/n.宇宙 universal adj.普遍的 universally adv.普遍地34.crucial/krul/adj.至关重要的 be crucial to
6、sb/sth 某人某事至关重要35.orbit/bt/v.围绕.运动 n.轨道36.astronomer/strnm/(r)n.天文学家 astronomy n.天文学37.merely/mli/adv.仅仅 mere adj.仅仅的，纯粹的38.administration/dmnstren/n.管理；行政部门 administrate v.管理/支配 administrator n.管理员39.agency/ednsi/n.机构 agent n.代理人 prise/kmpraz/v.包括be comprised/made up/consist of 由.组成41.scan/skn/v.扫描
7、 n.扫描检查42.plain to see 显而易见的43.foundation/fanden/n.基础 lay the foundation for 为.打下基础44.purse/ps/n.资金；钱包45.tale/tel/n.故事 a fairy tale 一个童话故事 46.origin/rdn/n.起源；出身 original adj.起初的 originate v.起源于47.shuttle/tl/n.航天飞机 v.频繁往来 48.frequency/frikwnsi/n.发生率 frequent adj.frequently adv.频繁地49.hydrogen/hadrdn/n
8、.氢气 oxygen/ksdn/氧气50.rocket/rkt/n.火箭51.motive/mtv/n.动机 motivation n.动力 motivate v.刺激52.investment/nvestmnt/n.投资 invest in 投资于.investment n.investor n.投资者53.calculate /klkjulet/v.计算；预测 calculation n.计算 calculator n.计算器54.coverage/kvrd/n.新闻报道 cover the event 报道事件55.mechanic/mknk/n.机械师56.assistant/sstnt/n.助理 assistance n.assist v.协助 assist sb in doing/with/in sth 57.incredibly/nkredbli/adv.难以置信地 incredible adj.58.dust/dst/n.沙尘 dusty adj.59.shelter/elt(r)/n.住处 v.保护 shelter/protect sb from sth 庇护某人不受.60.constant/knstnt/adj.不变的 constantly adv.不变地61.nuclear/njukli(r)/adj.核能的 nuclear weapons 核武器
