![Nextautumnwhenyouseewildgeeseheadingsouthforthewinterfl...]( "Nextautumnwhenyouseewildgeeseheadingsouthforthewinterfl...")
- 问题详情：NextautumnwhenyouseewildgeeseheadingsouthforthewinterflyinginaVformation,youmightthinkaboutwhatscientistshavediscoveredastowhytheyflythatway.Aseachbirdflapsitswings,itcreatesuplift(提升)forthebirdimmediatelyfollowing.ByflyinginaVformationthew...
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