当表示"灯,电灯"的时候是可数的.. 当表示光线的时候是不可数的.. want you to sit right here and don't move,okay? don't turn on the light.don't turn off the light. 我要你坐在这 不要动 明白吗? 别开灯 也别关灯 So,it's important to get a little bit of a sense of what all these different kinds of lights do. 对所有这些不同种类的光波,有个大致的了解是非常重要的
