顺便说一下，给客人看木塞可以追溯到酒标出现之前的年代，因为那时没有方法能证明酒真的是那个酒厂生产的。

By the way, presenting the diner with the cork dates back to the days before bottle labels, when there was no proof a wine was actually made by the winery it was attributed to.

youdao

佩里的歌剧已经遗失了，因为那时没有音乐出版。 不过，我们知道有这部歌剧是闪为很多人就《达芙妮》的演出写了不少评论。

Peri's opera is lost, because there were no music publishers then, but we know it existed because so many people wrote comments about the performance of Daphne.

youdao

那时生活比较艰苦，因为我俩都没有工作。

Life was harder then because neither of us had a job.

《牛津词典》

It was a beginning, but it didn't take because they had technical problems.

但是当时政策成型后并没有执行,因为那时存在技术上的一些问题。

耶鲁公开课 - 金融市场课程节选