1.all at once 突然；同时

That is what is new among asians elusive, unannounced and unmistakable all at once.
这在亚洲人身上是一种新现象，来得难以捉摸、突然，却又明确无误。

I was asking myself these questions when all at once I heard the singing voice of a child in a nearby house.
当我突然听见附近房子里孩童歌声时，我向自己如此发问。

2.for oft 经常

For oft, when on my couch I lie.
每当我在床上彻夜不眠。

For oft, when my couch I lie.
我常仰卧在长椅上。