stichomonad

例句：

1. 1. The snail is a fascinating creature that can live for up to 20 years.
   蜗牛是一种令人着迷的生物，可以活长达20年。
2. 2. The snail's shell is made of calcium carbonate, which is similar to theshells of other mollusks.
   蜗牛壳由碳酸钙构成，这与其他软体动物的壳相似。
3. 3. Scientists have been studying the behavior of snails for decades, trying to understand how they adapt to their environment.
   科学家已经研究蜗牛的行为几十年了，试图理解它们如何适应环境。