gymnotremoid

例句：

1. 1. The gymnotremoid was a rare species found in the deep ocean.
   这个无脊椎动物是深海中的一种罕见物种。
2. 2. The gymnotremoid is known for its unique ability to breathe through gills.
   这种无脊椎动物以其通过鳃呼吸的独特能力而闻名。
3. 3. Researchers have been studying gymnotremoids for decades, hoping to unlock their secrets.
   研究人员已经研究了几十年，希望揭开这些无脊椎动物的秘密。