Pollen never deteriorates . it is one of the few naturally secreted substances that last indefinitely.

花粉永远不会变质，是自然界中少有的几种可以无限期存在的物质之一。

youdao

Pollen never deteriorates . it is one of the few naturally secreted substances that last indefinitely.

花粉永远不会变质，是自然界中少有的几种可以无限期存在的物质之一。

youdao