1, WeChat business, the earliest translation handed down from the late Qing Dynasty to the early Republic of China, is now a derivative. Derivative = differential (preferred by Commonwealth) = derivative (preferred by US and Canada).
2.dy is the differential of Y, dx is the differential of X, and dy/dx is the ratio of the two differentials, which is the original intention of WeChat business. Now it's called derivative, and the translation of WeChat business is very vivid.
3. Learning modern mathematics and science should be combined with the original meaning of English to avoid misunderstanding. For example, when translating modern mathematics, science and engineering terms in Chinese, the translation of the older generation is relatively simple, such as WeChat business; Nowadays, translation is flashy, such as careful collection.