您好,dinosaur若为特指,要加the。例句:How about the dinosaur twins in the other room?若为复数,不特指,什么也不用加例句:Dinosaurs were large reptiles which lived in prehistoric times.若为单数,前面要加a例句I'm just a dinosaur不定冠词用于可数名词单数前,不具体说明何人或何物。定冠词用于若前面提过人或物,后面的名词所添加的。或者是特指的情况下或者是对话中双方都明白是哪只恐龙的情况下。希望能够帮到您!