The sea cucumber that the merchant bought for you for free is soaked. There are two kinds of sea cucumbers sold by merchants: light dry sea cucumber and salted sea cucumbers. When eating these two kinds of sea cucumbers, you need to soak them in advance and put them in the refrigerator for freezing. When eating, take it out with clear water and soak it for a while before eating. However, soaking sea cucumbers is a very troublesome job, and most people really can't soak them well. So, as long as you buy my sea cucumber, I will give you sea cucumber for free, that's what I mean.