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Nowadaysitismoreconvenientandeasierforpeopletotraveltoothercountriesisitdevelopmentapositiveornegativeeffect 参考范文 Neverbeforewastravellingtoaliencountriessoconvenientandpopularasinthiscentury.Thisphenomenonispartiallyattributedtoimprovedtechnologyandcheapflighttickets.Facingthistravelfrenzysomeareconcernedthatitwillbringabouttoomanysideeffectswhilstothersinsistthatisshouldbesupportedandmaintained. Admittedlycross-bordertravelhasmoredownsidesthanone.Firstlythecarbondioxideplanesemittedisreportedtobedisproportionatelymorethanthatemittedbyothertransportationmeans.Thecarbondioxidewillleadtoozonelayerthinningandtherebyincreasetheprobabilityofpeoplecontractingskincancer.Moreoverbeingeasierandmoreconvenienttotravelamongcountriesmeansthatsomecriminalscouldfleetoothercountriesaftercommittinghideouscrime.Thiswillposeathreattolocalsecurity...。