单词	air stack
释义	air stack noun : planes circling at different assigned altitudes above an airport while waiting their turn to land Word History First Known Use circa 1957, in the meaning defined above
随便看	orthicons orthid Orthis orthite orthitic ortho ortho ester ortho nitraniline orange ortho nitroaniline ortho- ortho-cousin ortho-hydrogen ortho-xylene orthoarsenate orthoarsenic acid orthoaxes orthoaxis orthobenzoquinone orthocarbonic acid orthocarbonic ester Orthocarpus orthocenter orthocenters orthocentre orthocentres

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