二級筆譯實務真題講解2012

Farmerswhosetreesareteemingwithworkerants,however,donotneedtobotherwithanyofthis.InasurveyofseveralorchardsinBenin,DrvanMeleandhiscolleaguesfoundanaverageoflessthanonefruit-flypupaineachbatchof30mangoesfromtreeswhereworkerantswereabundant,buta ageof77pupaeinbatchesfromtreeswithoutworkerants.Theworkerants,itturnsout,areverythoroughabouthuntingdownandeatingfruitflies,aswellasahostofotherpests.

WorkerantshavebeenusedforpestcontrolinandotherAsiancountriesnturies.ThepracticehasalsobeenadoptedinAustralia.ButDrvanMelearguesthatitisparticularlysuitedtoAfricaseworkerantsareendemictothemango-growingregionsofthecontinent,andlittletrainingorcapitalisneededtoputthemtowork.Allyouneedslocateasuitablenestandrunstringfromittothetreesyouwishtoprotect.Theantswillthenquicklyfindtheirwaytothetarget.TeachingagroupoffarmersinBurkinaFasotouseworkerantsinthiswaytookjustaday,accordingtoDrvanMele.Thosefarmersnolongerusepesticidestocontrolfruitflies,andsoareabletomarkettheirmangoesasorganictoeagerEuropeanconsumers,vastlyreasingtheir e.Theants,sotospeak,areonthemarch.

利用工蟻防治病蟲害的做法及其他亞洲國家已有數(shù)百年，澳大利亞也已予以采用。但是，范﹒梅爾博士稱，非洲芒果產(chǎn)區(qū)工蟻特別常見，所以這種滅蠅方法對非洲特別適用，而且操作起來不需要多少培訓或。果農(nóng)只需要找到一個合適的蟻巢，用一根繩子將其引向果樹，這樣工蟻很快就可以找到果蠅。范﹒梅爾博士說，在布基納法索培訓果農(nóng)只需一天時間。這些果農(nóng)今后不再需要殺蟲劑滅蠅，同時，還可以向熱衷有機食品的歐洲消費者推銷他們的有機芒果，從而大大提高收入。打個比方說，工蟻現(xiàn)在正向果蠅全面Therewas,lastweek,aglimmerofhopeintheworldfoodcrisis.Expectingabumperharvest,relaxedrestrictionsonexports.Overnight,globalwheatpricesfellby10percent.Bycontrast,tradersinBangkokquotericepricesaround$1,000aton,upfrom$460twomonthsago.Suchisthevolatilityoftoday’smarkets.Wedonotknowhowhighfoodpricesmightgo,norhowfartheycouldfall.Buthingiscertain:Wehavegonefromaneraofplentytooneofscarcity.Expertsagreethatfoodpricesarenotlikelytoreturntothelevelstheworldhadgrownaccustomedtoanytime

上周，世界出現(xiàn)了一線轉機