This faster - moving air provides the pelvic fin with additional lift.
这快速流动的气流为腹鳍提供了额外的升力.
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I have never been able to do so , and prefer to look pelvic fin.
有些人可以采取一看胸鳍, 立即知道它的男性或女性.
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英英释义
Noun
1. either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate