单词	plane at infinity
释义	plane at infinity : the aggregate of all points at infinity in projective geometry of three dimensions Word History Etymology plane entry 4
随便看	PFI pfit Pfitzer's juniper PFLAG pfleiderer pfleidering machine Pforzheim pfte pfx pg PG-13 PGA pgn PGT pH pH meter ph.d. ph.d.s pha pha-ad pha-fe pha-to phac- phacelia phacelias

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