Their backs were battleship gray topped with a saw-toothed line of small yellow dorsalfins.
它们的背部是军舰的灰色，最上方是呈锯齿状的黄色背鳍。
2
Their body color and appearance were observed and recorded. and 29 items which covered body length, body weight, perimeter, dorsalfins and teeth etc.
对其体色及外部形态进行观察，并测定体长、体重、体围、鳍和齿式等29个项目。
3
They were documenting the dorsalfins of sharks, as part of an identification program, when a 10-foot-long great white shark suddenly landed on their vessel.