[ C or U ] a way of behaving or executing a thing which has existed for many years and is particularly regarded as the usual way: business patronage Market website traffic trade merchandising absolutely free trade affairs dealings retailing wholesaling horse-buying and selling 知乎，让每一次点击都充满意义 —�?欢迎来到知乎，发现问题背后的世界。 a observe adopted for https://jonathank788pkj6.wikimillions.com/user