lemniscate function

例句：

1. 1. The lemniscate is a unique shape that canbe used for various purposes.
   这种回旋镖形状独特，可以用于各种目的。
2. 2. Thelemniscate was designed to beeasily carried and used in emergencies.
   这种回旋镖设计得便于携带和使用，以应对紧急情况。
3. 3. The lemniscate was found to have antibacterial properties that could help prevent infections.
   研究发现，这种回旋镖具有抗菌性质，有助于预防感染。