The mouthlike parts of the tubes fanned out along the shell's opening edges.

管子的嘴状部分沿着壳的开口边缘呈扇形展开。

Zhang and his colleagues wondered if the tube-dwellers had been snatching food at the shell's edge, before the brachiopod could eat it.

张和他的同事们想知道， 在腕足动物吃掉食物之前， 管栖动物是否一直在抢夺壳边缘的食物。