Turtles can live up to a hundred years. Turtle is a reptile. 都是泛指,为什么表达乌龟寿命可以长达百年用复数,而乌龟是爬行动物却用单数?
可数名词指类用法有三种,即零冠词+复数名词,定冠词+单数名词,以及不定冠词+单数名词。就你以上二个句子而言,三种形式都是可以的。
Turtles/A turtle/The turtle can live up to a hundred years.
A turtle/The turtle is a reptile.
Turtles are reptiles.
并非所有语境都可以使用这三种形式。例如:
Tigers are in danger of extinction. (正)
The tiger is in danger of extinction. (正)
A tiger is in danger of extinction. (误)
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