英语句子结构分析 we have only to turn to that extraordinary discovery of echo-location in bats t

题目

英语句子结构分析 we have only to turn to that extraordinary discovery of echo-location in bats t
we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role
that 和 extraordinary discovery of echo-location 是同位语关系么 ?
这句话怎么翻 ?

答案