Outdoor与Outdoors仅差一个“s”,却分属不同词性。Outdoor是形容词,需修饰名词,如“outdoor舞台”“outdoor午餐”,用于界定事物“户外”属性;Outdoors是副词,说明动作发生地点,如“play outdoors”“go outdoors”,可单独作地点状语。日常易混淆,如“outdoors activity”“go outdoor”均为错误用法,正确应为“outdoor activity”“go outdoors”。二者各司其职:Outdoor定义事物,Outdoors...