不禁一笑 meaning in English

cannot repress a smile

Elizabeth could not help smiling at his easy manner of directing his friend
伊丽莎白听到他能够这样轻而易举地指挥他的朋友，不禁一笑。
Then she led us to a supermarket where big crowds of people were gathered . following her , we saw her walk with a grocery basket in her hand . what a sweet mother
之后就带著我们往人潮多的超市走去，随行在后，见她一手还提著菜篮子，不禁一笑，好可爱的妈妈！
As he spoke there was a sort of smile , which elizabeth fancied she understood ; he must be supposing her to be thinking of jane and netherfield , and she blushed as she answered ,
他说这话的时候，不禁一笑，伊丽莎白觉得自己明白他这一笑的深意：他一定以为她想起了吉英和尼日斐花园吧，于是她红了脸回答道：
Elizabeth , who was left by herself , now smiled at the rapidity and ease with which an affair was finally settled , that had given them so many previous months of suspense and vexation
伊丽莎白一个人留在那儿，心想：家里人为了这件事，几个月来一直在烦神担心，如今却一下子便得到了解决，她想到这里，不禁一笑。