The people who died were good at swimming, the reason they got killed was the invisible demon under the seawater.

When summer comes, people like to go to the beach and play in the seawater. It is such a good way to drive away the hotness. But it has been reported that many people drawn while they were swimming on the beach. The people who died were good at swimming, the reason they got killed was the invisible demon under the seawater. In the afternoon, there are some vortexes under the seawater, which people can’t see. When people go swimming, they will be absorbed by the vortexes, even though they are good at swimming, they can’t resist the strong power. So when we go to play in the beach, we must take care. 
当夏天到来的时候，人们喜欢去海边玩水。这是一种驱散炎热的好办法。但是据报道，很多人在海边游泳的时候被淹死了。这些人是擅长游泳的，他们丧命的原因在于水下面看不见的魔鬼。午后，海水下游很多漩涡，这是人们看不到的。当人们游泳的时候，他们会被漩涡吸引，即使他们擅长游泳，也无法抵抗这样的强力。因此当我们在海边玩时，必须要小心点。