写四大发明的英语作文、

(1)

Themankindtakethebearingstomainlydependthesunbeforethemariner'scompassinvent,moonetc.heavenlybody,perhapsmountainstonetreeetc.markingthing,however,thesemeansesfortakingthebearingsallhasittolimitsex:istakenthebearingsbyheavenlybodyunderthebadweatherenvironmentandthencan'tcarryout,forexamplerainyday,fogday,cloudyday.Butdependmarkingathingtotakethebearingscanlimitatinsidesmallscope.

AfterwardspeoplediscoverthesouthNorthPolecharacteristicofloadstonebutinventedmariner'scompass.Cantakethebearingsaccuratelyunderanyenvironmentthus.

Mariner'scompassthebiggestcontributionistopromotemaritimedevelopment,transportattheseaofflourishinganddiscoverNewContinentetc.themariner'scompassesallperformfeats

(2)

Beforecompassinventionthehumanitytakesone'sbearingsmainlydependsonthesun,heavenlybodyandsoonthemoon,orsignandsoonmountainstonetrees,however,thesetakeone'sbearingsthemethodallhasitslimitation:Dependsontheheavenlybodytotakeone'sbearingsunderthebadweatherenvironmentisunabletorealize,forinstancerainyday,foggyday,cloudydayButdependsonthesigntotakeone'sbearingsonlycanlimitinthesmallscope

AfterwardsthepeoplediscoveredthemagnetthesouthNorthPolecharacteristichasinventedthecompassThusmayaccuratetakeone'sbearingsunderanyenvironment

Thecompassbiggestcontributionpromotedthenavigationdevelopment,theseatransportationthenewcontinentcompassandsoonwasdevelopedaswellasdiscoveredallhadlastingachievements

都是关于指南针....四项全写的话、题材蛮大....