She got up and put on her own clothes, handed the coat back to Jun Lonely, he took it back and put it back on her body, and lifted her left sleeve, seeing the wound on her cloth, her face was full of distress, "Does it still hurt?" ”

"It doesn't hurt." She said indifferently.

Youqi walked over and looked at her wound with a frown, "Yun'er, when was your left wrist injured, why didn't this prince know?" ”

"It's okay, I just accidentally got hurt by a sharp stone." She wouldn't tell him that she had cut herself, "It's just a small injury, it's almost healing." Withdrawing her hand, she stood up and looked at the dew in the twenty pits, and then went to the bottom of the small stone hill in front of her, and saw that the bowl of leaves dripping from the rock was filled with water.

The collected dew and the water in the dripping leaf bowl are not enough for three people to drink for a day.

There is no fresh water to wash his face and bathe, and the clothes on his body are soaked in seawater, and there is salt, which makes it uncomfortable to wear. There is no choice but to settle.

After thinking about it, she scooped a little water with fresh leaves, picked some clean grass, chewed it slightly, rubbed her index finger on her teeth with the bitten grass, and spit it out with two mouthfuls of water, which was a simple brushing of her teeth.

The two men also learned from her to wash their teeth, and they knew that fresh water was not easy to come by, so they were very water-saving.

After brushing his teeth with water, Jun Youqi sighed a little, "This prince now understands what water is more expensive than oil, no, it is more expensive than gold." In this kind of ghost place, food and drink are useful, and money is worthless. ”

"Actually, there are two other ways to get fresh water on the island." She said.

The two men were a little curious, and she said expressionlessly, "One is the distillation method, that is, the seawater is put in a container, put it on the fire and boil, then the container is covered with a lid, and the water vapor is stained with the lid, and it becomes fresh water when it condenses." ”

"What is a container?" Qi asked.

"It's for stuff."

"It's the equivalent of a pot. There are no pots and no lids. ”

"If you are diligent, you can carve a stone pot, and the lid can be replaced by large leaves, anyway, the water vapor will condense when it gets wet."

Jun Youqi thought for a while, "The collected dew and the water dripping from the rock crevices are not strong enough to drink, and the method you said is too troublesome." And the amount of fresh water to obtain is time-consuming and insignificant. ”

"Well, that's what I said." "I'm not going to use it." However, it would be nice to have a stone pot to cook something. ”

"What else is there to get fresh water?" He winked at her with beautiful dark eyes, "Yun'er, you shouldn't mean to wait for the rain, if it doesn't rain for a few days, you'll die of thirst." ”

"Of course not." She simply said, "It's reverse osmosis that uses seawater to get fresh water." ”

An evil spirit, a deep one, both eyes looked at her in confusion.

Such a high-tech thing, she really didn't bother to explain, and after saying it, the two ancients didn't understand it. It's all a head, not to mention it and it seems unkind, so she said simply, "It is to use the principle of selective permeability of semi-permeable membranes to hinder the passage of salts and other substances, so that seawater can pass through, and the salts are considered to filter out fresh water." ”

"What is a semipermeable membrane?" Jun Youqi was very surprised, "According to what you said, if there is a semi-permeable membrane, with this infiltration method, won't the seawater become fresh water at any time, and the fresh water will be inexhaustible?" ”

Sure enough. She said, "There are many semi-permeable membranes, such as the light membrane in eggs, fish fat, casings, and animal bladders...... Quite a lot. But a large semi-permeable membrane is required, which, apparently, cannot be found on the island. ”