He had seen the second fin now coming up behind the first and had identified them as shovel-nosed sharks by the brown, triangular fin and the sweeping movements of the tail.

他看见另一个鳍在第一个的背后冒出水来，根据这褐色的三角形鳍和甩来甩去的尾巴，认出它们正是铲鼻鲨。