Nobody was really sure what happens if you answer the hardest question he can come up with because it's never happened before.

如果我答起了他最刁钻的问题，没有人会确定会发生什么，因为这以前就没发生过。

youdao

Besides, when they put him into the ambulance and took him away, none of the paramedics actually told us that he was dead, so nobody really knew for sure.

而且，当他被送上救护车时，没有一个医务人员确切地告诉我们他已经死去，所以没有人确切知道他的生死。

youdao

Once Upon a Time there was a little flu virus. It was probably born in Kansas in late 1917 or 1918, although nobody is really sure. Its name was H1N1. It grew up to be very wicked.

1917年或1918年末(时间没人能够确定)在堪萨斯州曾出现过一种相当厉害的小型流感病毒，这种病毒就是H1N1。

youdao

Powerful as it was in places, that manuscript, published pretty much as he had left it, was pitifully incomplete and nobody could really be sure how Pasolini would have brought it to completion.

ECONOMIST: Italian novels