Having arrived unannounced for supper, we had to take potluck.是什么意思？

Having arrived unannounced for supper, we had to take potluck.

由于没有提前通知我们要来吃晚饭，我们只能吃些家常便饭。

having

n. 所有，持有；v. 有( have的现在分词 )，（亲属关系中）接受，拿，买到；

例句
He was accusing my mum of having an affair with another man...
他指责我妈妈与另一个男人有染。

arrived

v. 到达，来( arrive的过去式和过去分词 )，发生；

例句
...a bundle of letters which had arrived for me in my absence...
我不在期间寄给我的一大堆信件

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

supper

n. 晚饭，晚餐，夜点心，晚餐会；

例句
After supper he'd put his feet up and read. It was a pleasant prospect.
晚饭后他会支起双腿，歇一歇，看看书。那真是件很惬意的事情。

we

pron. 我们，咱们，笔者，本人，朕，人们；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

take

vt. 拿，取，采取，接受（礼物等），耗费（时间等）；vi. 拿，获得；n. 镜头，看法，收入额，场景；

例句
I take care of them to the best of my abilities...
我尽我所能地照顾他们。

potluck

n. 家常便饭，运气；

例句
The scheduled flight was canceled and passengers had to take potluck on the other airlines.
原定航班被取消了,乘客们只能在其他航线上试试运气.