英语翻译
Swallowtiresnotnordoesitboastofitspower,butbelongstotheair,travellingitmaybesixthousandmilestoandfromitsnorthernnestinghomefeedingitsflownyoungasitfliesandslippingthroughamediumthatseemstohelpitspassageevenwhenthewindisadverse.