frilled shark

基本解释

Sightings of living frilled sharks are rare, because the fish generally remain thousands of feet beneath the water's surface.
活生生的皱鳃鲨十分罕见，因为它们大都生活在水面下数千英尺的地方。
Considered living fossils, frilled sharks bear many physical characteristics of ancestors who swam the seas in the time of the dinosaurs.
皱鳃鲨可以称得上是活化石了，在外形上还保留着许多它生活在恐龙时代海洋中的先祖的特征。
Humans rarely encounter frilled sharks, which prefer to remain in the oceans' depths, up to 5, 000 feet (1, 500 meters) below the surface.
皱鳃鲨喜欢待在海面以下5000英尺（1500米）的海洋深处，因而鲜为人知。