Long after the kids had gone home, I noticed he'd forgotten to unfriend us.

但在孩子们回家很久之后，我发现他忘了解除和我的好友关系了。

youdao

To unfriend is drastic, used only in the direst of circumstances-like a bad breakup.

解除好友关系是很严重的事情，只有在类似分手这种情况下才会使用。

youdao

But with more than 1, 500 friends (at the peak), it would take all year to unfriend everyone.

但是拥有1500个朋友(最高峰的时候)，这需要花一整年的时间去删掉所有人。

youdao

The move came in response to a Greenpeace initiative called the Unfriend Coal Campaign, in which the environmental group enlisted 700, 000 online activists to pressure Facebook to power its data centers with clean energy instead of coal.

FORBES: Facebook Commits to Green Energy -- But Can It Deliver?