农业多功能的显现是一个从潜功能向显功能转变的漫长过程。

But it s a long time until all the function appears.

伸延适应这个词就是造来描述这些在进化历史中普遍得令人惊讶的功能转变的。

The word exaptation was coined to cover these shifts in function, which are surprisingly common in evolutionary history.

第三章分析藏书票的历史特征和功能转变。

Chapter III analyzed the history books ticket changes in features and functions.