tergites ring

例句：

1. 1. The fish had a pair of tergites on its back.
   这条鱼有一对背鳍。
2. 2. The dolphin has a unique tergites pattern.
   海豚有一个独特的背鳍图案。
3. 3. The fish swims using its tergites to propel itself forward.
   这条鱼使用它的背鳍来推动自己前进。