Imagine that you are swimming in the sea and suddenly you see a shark, what will you do?

想象一下你现在在海里游泳，突然间你看见一条鲨鱼，你会怎么做？

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The shark bumps you to find out if you are fit to be eaten and then bites you if it thinks you are.

鲨鱼先撞击你，看看你是不是适合作为食物，如果它觉得你适合就要咬食你了。

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The shark attacks because it thinks you are a fish, but when it tastes a human it decides not to eat you.

鲨鱼之所以发起攻击，是因为它觉得你是一条鱼，但当它尝到的是人的味道时就决定不吃了。

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"Imagine you are below the shark, the shark is swimming and you have the light from the Sun coming down, " explained Dr Julien Claes, a shark biologist from the Catholic University of Louvain in Belgium, and the lead author of the study.

BBC: Glowing shark scares off predators with 'lightsabers'

Shark Net was designed to serve marine biologists, but you can bet surfers on the California coast are using it as well.

FORBES: Why Sensors Are a Force of Context

If you're diving in these areas, be aware of the shark risk before you enter the water, and dive with at least one partner, as sharks are less likely to mess with a group.

CNN: Stranded at sea? Follow this 7-step extreme survival guide