Dragonfish or Arowana: Within primitive fish and also tropical fish, but people list it sole customarily.
本属古代鱼类也可属热带鱼类,但人们
惯将其单列一类.
惯上,俗上,
常
,普普;
;
;
统上,说上;常，经常;;惯上的, 惯常的, 合乎俗的;;惯;;Dragonfish or Arowana: Within primitive fish and also tropical fish, but people list it sole customarily.
本属古代鱼类也可属热带鱼类,但人们惯将其单列一类.
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