Why is Dian called Shuiyu in Japanese?

Landlord, you have an extremely paranoid idea. According to your meaning, Japanese should be the same as Chinese. Then why don't you understand Japanese? A long time ago, almost all Chinese characters were used in East Asia, such as those used in Korea and Vietnam, but none of them spoke Chinese, understand? They just borrowed our words. Think about it. If the passer has a slight deviation in the understanding of Chinese characters, will it lead to a deviation in the understanding of everyone in this place? Therefore, not every word has the same meaning as Chinese. For example, "news" in Japanese refers to newspapers and "toilet paper" refers to letters. There are many things here, which may not be exactly the same as Chinese. Many words in Japanese are self-created. For example, the word "photo" was made in Japan and returned to China. Therefore, there are many differences between cultures, so the landlord should not be so serious.