They had been invited to a Hindu wedding and were not sure what happened on such occasions.

有人邀请他们去参加一个印度教徒的婚礼，但他们不清楚这样的庆典会是怎样一种场面。

《牛津词典》

The French, after all, were not sure if the joint venture would last.

毕竟法国一直不确定合营公司是否能长久。

youdao

The British media were not sure what to make of this swaggering ego with playboy looks.

英国媒体不清楚，是什么让这个高傲的自大狂拥有一副花花公子的面相。

youdao

Some of the guests were not sure what to think of Ellen and Doug's celebration -- or even how to describe it.

VOA: special.2011.05.23

I'm sure there were bows and arrows at that time, but they did not yet have the kind of armor that they would have in this time.

我能肯定那个时候已经有弓箭,但强力的盔甲,那时肯定还没有出现

耶鲁公开课 - 古希腊历史简介课程节选

Plato's views on democracy were not all negative, to be sure.

并非都是负面的，这可以肯定。

耶鲁公开课 - 政治哲学导论课程节选

As to how they might be able to do that, they were not sure.

WSJ: Escape From a North Korean Prison

The central problem was that they were not sure that in his heart, he was a real conservative.

BBC: Has Mitt Romney got what it takes?

That created "investor uncertainty" as people were not sure how much to budget for in the future, he said.

BBC: Renewable heating systems: Household grants available