1. The uncinus is a tiny hook-like structure found on the edge of certain types of plant leaves. （uncinus是一种在某些植物叶片边缘上发现的小钩状结构。）
2. The uncinus is used to attach the leaf to other surfaces, helping the plant to climb or attach itself for support. （uncinus用于将叶片附着在其他表面上，帮助植物攀爬或依附以寻求支撑。）