They only invited Jack and Sarah as an afterthought .是什么意思？

They only invited Jack and Sarah as an afterthought .

他们邀请杰克和萨拉不过是事后想起的补救办法。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

only

adj. 唯一的，仅有的，最好的，最适当的；adv. 只，仅仅，结果却，不料；conj. 但是，可是，要不是；

例句
Outsiders who wed islanders are given only three years' right of abode at first.
岛外的人和岛民结婚之初只能获得三年的居住权。

invited

v. 邀请( invite的过去式和过去分词 )，请求，引诱，招致；

例句
She invited 750 people aboard the luxury yacht, the Savarona...
她邀请了750人乘坐豪华游艇“萨瓦罗纳”号。

jack

n. 千斤顶，[信]插孔，插座，男人，纸牌中的J；vt. 提高，增加，用千斤顶顶起，抬起，抬起，使想起；vi. <美>用篝灯打猎（或捕鱼）；

例句
He told her their affair would have to stop, because Jack Smith was blackmailing him...
他告诉她说他们的婚外情必须结束了，因为杰克·史密斯正在敲诈他。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

Sarah

n. 莎拉；

例句
Since he came to live with me, we have been subject to a campaign of spite and revenge which makes Lady Sarah appear angelic by comparison.
自从他来与我同住，我们之间便摩擦不断;相比之下，萨拉夫人倒显得一副菩萨心肠。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

afterthought

n. 事后的考虑或想法，事后聪明，事后再想起，后来添加的东西；

例句
Almost as an afterthought he added that he missed her.
他又几乎不假思索地补充说他想念她。