whereon是什么意思

adv.在什么上面,(关系副词)在那上面

1、They were sitting on the grass, their bikes beside them and their picnic spread whereon.
他们坐在草地上，他们的自行车放在旁边，野餐摊在上面。
2、This is a detailed report whereon the decision will be based.
这是一份详细的报告，决策将以此为基础。

在其上；关于那个。