adj.pertaining to the ambulacra of radial echinoderms

1. The ambulacral grooves of the sea star are lined with tube feet, which help it move along the ocean floor.
   海星的足溝上布滿了管足，幫助它在海底移動。
2. The structure of the ambulacral system is crucial for the survival of echinoderms.
   足溝系統(tǒng)的結構對于棘皮動物的生存至關重要。