实例中常用curiosity about，亦即最好这样写：curiosity about exploring external world
例句：
Children have a natural curiosity about the world around them.
As human beings, we have great curiosity about how nature works.
此外，out of curiosity或with curiosity也是不错的:
To explore external world out of curiosity.
or
To explore external world with curiosity.
例句：
She decided to follow him out of curiosity./Out of curiosity, she decided to follow him.
They watch the adventurers with curiosity./With curiosity, they watch the adventures.
