pectoral fin的用法和样例：

例句

用作名词(n.)

Winglike pectoral fins extend along the sides of the head.翼状的胸鳍沿头的两侧延伸生长。
Oddly enough, this ventilation shift may have kicked off the gradual morphing of the shoulder girdle and pectoral fins.奇怪的是，这呼吸上的改变有可能启动了前肢带与胸鳍的形态逐渐改变。

Shark's fin soup

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This is the VOA Special English Economics Report. In recent years, a shining city grew in the desert of Dubai on -- and even off -- the Gulf coast. An island shaped like a palm tree was built for hotels, homes and entertainment. In October of last ye

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VOA慢速英语2009年（十二）月

2 Unusual Things Affected by the Financial Crisis

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German FinMin urges Greek opposition to back reforms

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英语新闻

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buckled under