上市

fruit可数吗？名词 fruit 的可数性问题fruit表示水果时，既可以是可数的，也可以是不可数的，其区分原则是：1. 用作物质名词，泛指一般意义的水果，不可数。如：Fruit is cheapest in season. 水果在上市季节最便宜。Fruit quickly goes

BEIJING - China's homegrown Beidou Navigation Satellite System began providing initial positioning, navigation and timing operational services to China and its surrounding areas from Tuesday, a spokesman for the system s