说起来，我楼上还有两个电池可以给你。

___Come ___to ___think ___of ___it, I've got two batteries that you can have upstairs.

想起来，这真的很难说。

___Come ___to ___think ___of ___it, it really is quite difficult to say.

说起来，我昨天应该给她打电话的。

___Come ___to ___think ___of ___it, I should have called her yesterday.