英语阅读有个句子看不懂,
ToSouthAmericans,robinsarebirdsthatflynortheveryspring.ToNorthAmericans,therobinssimplyvacationinthesoutheachwinter.Furthermore,theyflytoveryspecificplacesinSouthAmericaandwilloftencomebacktothesametreesinNorthAmericanyardsthefollowingspring.Thequestionisnotwhytheywouldleavethecoldofwintersomuchashowtheyfindtheirwayaround.Thequestionperplexedpeopleforyears,until,inthe1950s,aGermanscientistnamedGustaveKramerprovidedsomeanswersand,intheprocess,raisednewquestions.
我不懂得是Thequestionisnotwhytheywouldleavethecoldofwintersomuchashowtheyfindtheirwayaround.这句话,尤其是somuchas