2、Waterboilsat100degreesCelsius.(水在100摄氏度时沸腾。)

3、TheEarthorbitsthesun.(地球绕着太阳运转。)

4、Oxygenisnecessaryforhumanlife.(氧气对人类生命必不可少。)

5、Thespeedoflightis299,792,458meterspersecond.(光速为299792458米每秒。)

6、ObjectsfalltowardthecenteroftheEarthduetogravity.(物体由于重力向地球中心落下。)

7、Alllivingorganismsarecomposedofcells.(所有生物体都由细胞构成。)

8、TheEarthisapproximately4.5billionyearsold.(地球大约有45亿年历史。)

9、Energycannotbecreatedordestroyed,onlytransferredorconverted.(能量不能创造或毁灭，只能转移或转换。)

10、Thespeedofsoundisapproximately343meterspersecondatroomtemperature.(声速在室温下大约是343米每秒。)

11、TheEarth'satmosphereisapproximately78%nitrogenand21%oxygen.(地球大气层约有78%的氮气和21%的氧气。)

12、Aforceisrequiredtochangethevelocityofanobject.(改变物体速度需要施加力。)

13、Allmatterismadeupofatoms.(所有物质由原子构成。)

14、Saltwaterhasalowerfreezingpointthanpurewater.(盐水的冰点比纯水低。)

15、TheEarth'smagneticfieldisgeneratedbythemotionofmoltenironinitscore.(地球磁场由其核心熔融铁流动产生。)

16、Thespeedofafallingobjectisdeterminedbytheforceofgravityandresistancefromtheair.(物体下落的速度由重力和空气阻力决定。)

17、TheEarthexperiencesfourseasonsduetoitsaxialtiltandorbitaroundthesun.(地球由于其轴倾斜和绕太阳的轨道经历四季。)

18、Thehumanbodyhas206bones.(人体有206块骨头。)

19、Thespeedofanobjectinavacuumisconstant.(在真空中物体速度恒定。)

20、TheuniverseixxelievedtohaveoriginatedfromasingularityknownastheBigBang.(宇宙起源于被称为大爆炸的奇点。)

21、Theboilingpointofwaterdecreaseswithaltitude.(水的沸点随高度增加而降低。)

22、Thespeedofanobjectdecreasesasitapproachestheeventhorizonofablackhole.(物体接近黑洞的视界时速度减慢。)

23、Thehumanbrainconsistsofapproximately100billionneurons.(人脑包含约1000亿个神经元。)

24、TheEarth'srotationonitsaxisisresponsiblefordayandnight.(地球绕着自己的轴旋转导致昼夜交替。)

25、Themeltingpointofasubstanceisacharacteristicproperty.(物质的熔点是一种特性属性。)

26、Thetidesresultfromthegravitationalforcesofthemoonandsun.(潮汐是由月球和太阳的引力造成的。)

27、Allmatterintheuniverseismadeupofparticlesknownasquarksandleptons.(宇宙中所有物质都由被称为夸克和轻子的粒子组成。)

28、Thespeedofawaveisdeterminedbyitsfrequencyandwavelength.(波速由其频率和波长决定。)

29、Thedensityofasubstancecanbeusedtodetermineitspurity.(物质的密度可以用来确定其纯度。)

30、Theprocessofphotosynthesisinvolvestheconversionofsunlightintochemicalenergy.(光合作用的过程涉及将阳光转化为化学能。)

31、Thehigherthealtitude,thelowertheatmosphericpressure.(海拔越高，大气压越低。)

32、Thehumanheartpumpsapproximately7,200litersofbloodperday.(人心每天约泵出7200升血液。)

33、Thespeedofanelectromagneticwaveisapproximately299,792,458meterspersecond.(电磁波速度约为299792458米每秒。)

34、TheEarth'sozonelayerisresponsibleforabsorbingharmfulultravioletradiationfromthesun.(地球的臭氧层负责吸收来自太阳的有害紫外线。)

35、Theboilingpointofasubstancedecreasesathigherelevationsduetoloweratmosphericpressure.(由于低大气压，物质的沸点在较高的海拔下降低。)

36、Thehumaneyeiscapableofperceivingarangeofcolorsknownasthevisiblespectrum.(人眼能够感知被称为可见光谱的一系列颜色。)

37、TheEarth'smagneticfieldprotectstheplanetfromharmfulcosmicrays.(地球磁场可以保护行星免受有害的宇宙射线侵害。)

38、Thehumanbodyisapproximately60%water.(人体大约含有60%的水。)

39、Thespeedofaprojectiledecreasesasitriseshigherintotheairduetoairresistance.(由于空气阻力，抛射物随着高度升高速度降低。)

40、Theprocessofrespirationinvolvestheexchangeofoxygenandcarbondioxideinthelungs.(呼吸过程涉及肺部的氧气和二氧化碳的交换。)

41、TheEarth'satmosphereisdividedintoseverallayerxxasedontemperatureandcomposition.(地球大气分为几个层次，根据温度和成分划分。)

42、Thehumaneariscapableofdetectingsoundswithinacertainrangeoffrequenciesknownastheaudiblespectrum.(人耳可以检测到一定频率范围内的声音，称为可听频谱。)

43、Thesurfacetemperatureofthesunisapproximately5,500degreesCelsius.(太阳表面温度约为5500摄氏度。)

44、Theprocessofdigestioninvolvesthebreakdownoffoodintonutrientsthatcanbeabsorbedbythebody.(消化过程涉及将食物分解成身体可以吸收的营养物质。)

45、TheEarth'scrustiscomposedofseverallargetectonicplatesthatmoveandcauseearthquakesandvolcaniceruptions.(地球地壳由几个大型构造板块组成，它们移动导致地震和火山爆发。)

46、Theprocessoffermentationinvolvestheconversionofsugarintoalcoholororganicacids.(发酵过程涉及将糖转化为酒精或有机酸。)

47、Thespeedofabodyinmotioncanbecalculatedusingtheequationv=d/t(速度可以使用公式v=d/t计算。)

48、Theprocessofmitosisinvolvesthedivisionofacellintotwoidenticaldaughtercells.(有丝分裂的过程涉及将细胞分裂成两个相同的子细胞。)

49、Thehumanbodyrequiresacertainamountofdailyexercisetomaintaingoodhealth.(为了保持良好的健康状态，人体需要一定量的日常运动。)

50、Theprocessofosmosisinvolvesthemovementofwateracrossasemipermeablemembranefromanareaofhighconcentrationtoanareaoflowconcentration.(渗透过程涉及水的跨越半透膜从高浓度向低浓度区域的移动。)