"Nobody knows for sure and certain," said Martha.
“没有人确切知道。”玛莎说。
没人确切地知道。
"The problem is, nobody knows for sure what is going on," he said.
“问题是，没有人确切的知道将发生什么，”他说。
Nobody knows for sure ________________ dinosaurs disappeared from the earth in such a short time.
没有人确切地知道恐龙是由于什么原因，又是怎样在这么短的时间里从地球上消失的。
The meeting will be held in September, but nobody knows the date for sure.
会议将在九月举行，但没人知道确切的日期。
The meeting will be held in September, but nobody knows the date for sure.
会议将在九月举行，但没人知道确切的日期。
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