And bumping into the sharks' flanks helps the jacks to rid themselves of parasites and dead skin.往鯊魚的側面撞擊有助于六帶鲹清除身上的寄生蟲和死皮

bump into:猛撞，撞擊

He wasn't looking and ran bump into a tree.

他沒看好路猛然撞在一棵樹上。

rid of:擺脫

He wasn't rid of the mental burden.

他擺脫不了精神負擔。

Let's get rid of this mouldy old furniture.

咱們把這件老掉牙的舊家具扔掉吧。

And soon swarms of jacks pursue the sharks.很快便有成群的六帶鲹前去追逐鯊魚

swarms of:一群群； 一大堆

There were swarms of mosquitoes around here.

這兒蚊蟲成群。

She left amid a swarm of photographers.

她離開時一群攝影記者圍著她。

Each tentacle is armed with paralysing stings that can kill a fish.每根觸須都長了具有麻痹作用的棘刺可能讓魚兒一命嗚呼

arm with: 武裝(用 ... 裝備)

We set out armed with warm clothes.

我們動身時帶了御寒的衣服。

Our fighter planes are all armed with cannon.

我們的戰斗機都裝備了機關炮。