periodical 词根

periodicadj.周期的；定期的（-ic形容词后缀）

periodicaladj.[数]周期的；定期的;n.期刊；杂志（-al名词或形容词后缀）

periodicallyadv.定期地；周期性地；偶尔；间歇（-ly副词后缀）

periodizev.把绘画、音乐、文学等划分时期或时代（-ize使动）

periodizationn.[数]周期化；（历史等的）时期（或时代）划分

periodontaladj.齿根膜的，牙周的（-dont牙齿，period周期-----牙周）

periodontitisn.[口腔]牙周炎

periodontistn.牙周病医师；牙周病学家

例句：Thereweremanyimportanteventsinthisperiod.

the hill we climb原文

TheHillWeClimb

Mr.President,Dr.Biden,MadamVicePresident,Mr.Emhoff,

Americans,andtheworld,

Whendaycomesweaskourselves:

Wherecanwefindlightinthisnever-endingshade?

Thelosswecarry,aseawemustwade.

We'vebravedthebellyofthebeast.

We'velearnedthatquietisn'talwayspeace.

Andthenormsandnotionsofwhatjustisisn'talwaysjustice.

Andyet,thedawnisoursbeforeweknewit.

Somehowwedoit.

Somehowwe'veweatheredandwitnessed

Anationthatisn'tbroken,butsimplyunfinished.

We,thesuccessorsofacountryandatime

Whereaskinnyblackgirl

Descendedfromslavesandraisedbyasinglemother

Candreamofbecomingpresident

Onlytofindherselfrecitingforone.

Andyes,wearefarfrompolished,farfrompristine,

Butthatdoesn'tmeanwearestrivingtoformaunionthatisperfect.

Wearestrivingtoforgeourunionwithpurpose,

Tocomposeacountrycommittedtoallcultures,colors,characters,andconditionsofman.

Andsoweliftourgazesnottowhatstandsbetweenus,

Butwhatstandsbeforeus.

Weclosethedividebecauseweknowtoputourfuturefirst.

Wemustfirstputourdifferencesaside.

Welaydownourarmssowecanreachoutourarmstooneanother.

Weseekharmtononeandharmonyforall.

Lettheglobe,ifnothingelse,

Saythisistrue

Thatevenaswegrieved,wegrew;

Thatevenaswehurt,wehoped;

Thatevenaswetired,wetried;

Thatwewillforeverbetiedtogethervictorious.

Notbecausewewillneveragainknowdefeat,

Butbecausewewillneveragainsowdivision.

uretellsustoenvision

Thateveryoneshallsitundertheirownvineinafigtree

Andnooneshallmakethemafraid.

Ifwe'retoliveuptoourowntime,

Thenvictorywon'tlieintheblade,

Butinallthebridgeswe'vemade.

Thatisthepromisetoglade,

Thehillweclimbifonlywedareit

BecausebeingAmericanismorethanaprideweinherit;

It'sthepastwestepintoandhowwerepairit.

We'veseenaforcethatwouldshatterournationratherthanshareit,

Woulddestroyourcountryifitmeantdelayingdemocracy,

Andthiseffortverynearlysucceeded.

Butwhiledemocracycanbeperiodicallydelayed,

Itcanneverbepermanentlydefeated.

Inthistruth,inthisfaith,wetrust

Forwhilewehaveoureyesonthefuture,

Historyhasitseyesonus.

Thisistheeraofjustredemption

Wefearedatitsinception.

Wedidnotfeelpreparedtobetheheirs

Ofsuchaterrifyinghour.

Butwithinit,wefoundthepower

Toauthoranewchapter

Toofferhopeandlaughtertoourselves.

Sowhileonceweasked

Howcouldwepossiblyprevailovercatastrophe?

Nowweassert

Howcouldcatastrophepossiblyprevailoverus?

Wewillnotmarchbacktowhatwas

Butmovetowhatshallbe

Acountrythatisbruised,

Butwhole,benevolent,butbold,fierce,andfree.

Wewillnotbeturnedaroundorinterruptedbyintimidation

Becauseweknowourinactionandinertiawillbetheinheritanceofthenextgeneration.

Ourblundersbecometheirburdens,

Butonethingiscertain,

Ifwemergemercywithmightandmightwithright,

Thenlovebecomesourlegacyandchangeourchildren'sbirthright.

Soletusleavebehindacountry

Betterthantheonewewereleft

Witheverybreathfrommybronze-poundedchest

Wewillraisethiswoundedworldintoawondrousone.

Wewillrisefromthegold-limbedhillsoftheWest.

Wewillrisefromthewind-sweptNortheastwhereourforefathersfirstrealizedrevolution.

Wewillrisefromthelake-rimmedcitiesoftheMidwesternstates.

Wewillrisefromthesun-bakedSouth.

Wewillrebuild,reconcile,andrecover

Ineveryknownnookofournation,

Ineverycornercalledourcountry,

Ourpeople,diverseandbeautiful,

Willemergebatteredandbeautiful.

Whendaycomes,

Westepoutoftheshadeaflameandunafraid.

Thenewdawnbloomsaswefreeit,

Forthereisalwayslight,

Ifonlywe'rebraveenoughtoseeit,

Ifonlywe'rebraveenoughtobeit.