1. In fact, this is because cucumbers were indeed yellow when they were first used as food. Yellow cucumbers are really mature, but they taste worse and have no moisture.
2. Someone accidentally discovered that cucumbers are actually green before they are ripe. When picked at this time, the cucumbers taste very good and crisp. Favored by most people. Over time, people no longer waited for the cucumber to be truly ripe before eating it. Instead, they picked it before it was ripe and put it on the table. The cucumber also changed its "color" in this case. In this way, step by step, green cucumbers became known as cucumbers in public life