let's say, as they would by biting a fish.

比方說，他們會像咬魚一樣。

So generally, they will release us and swim away.

所以一般情況下，他們都會放了我們，然後遊走。

These incidents were totally different.

這些事件是完全不同的。

The shark came in, attacked the victim, and came back

鯊魚進來了，攻擊受害者，然後回來了

and attacked again and again and again,

並一次又一次的攻擊。

and stayed with the victims until they

並陪著受害者，直到他們

were removed from the water.

被從水中取出。

That's a very determined animal.

這是一個非常堅定的動物。

NARRATOR: So what could cause sharks to display

那麼是什麼原因導致鯊魚表現出

such brazen determination?

如此厚顏無恥的決心？

For Collier, there can be only one explanation.

對於科利爾來說，只有一個解釋。

In my opinion, these animals were not investigating.

在我看來，這些動物沒有調查。

These were all predatory attacks.

這些都是掠奪性的攻擊。

These sharks were attempting to feed on the victim.

這些鯊魚試圖捕食受害者。

NARRATOR: Sharks trying to feed on humans.

鯊魚試圖以人類為食。

It's a terrifying and virtually unprecedented revelation.

這是一個可怕的、幾乎是前所未有的啟示。

It's extremely unique and very, very rare.

這是非常獨特的，非常非常難得的。

And we had to find out why.

而我們必須找出原因。

NARRATOR: So what could cause Egypt

那麼，是什麼原因導致了埃及

sharks to suddenly start attempting

鯊魚突然開始嘗試

to actually eat beachgoers?

真的要吃掉海灘上的遊客嗎？

For Dr. Dan Huber, such unnatural behavior

對丹-休伯博士來說，這種不自然的行為。

suggests that something equally unnatural

暗示著同樣不自然的事情

must be occurring in the predator's environment.

必鬚髮生在捕食者的環境中。

In fact, it could point to some kind of human intervention.

事實上，它可能指向某種人為干預。

Animals can be trained to exhibit certain behaviors

動物可以通過訓練來表現出某些行為

in response to a stimulus.

對刺激的反應。

And the reason why this works is because the stimulus

而之所以能成功，是因為刺激物

is associated with a reward.

是與獎勵相關的。

NARRATOR: This concept is known as conditioning.

旁白：這個概念被稱為調理。

One of the primary ways that this happens

發生這種情況的主要方式之一是

is if a shark gets hand fed over and over

是如果鯊魚被手工餵養一遍又一遍。

and over again, it's learning to associate people

而一次又一次，是學會了聯想到人

with a food reward.

與食物獎勵。

Which means that it's going to exhibit feeding

這意味著，它將表現出餵食

behaviors around people, even if that food reward isn't present.

在人們身邊的行為，即使該食物獎勵不存在。