确切地说:
1. properly speaking
2. be more exact
Examples:
1. 我不能确切地说出那所房子的年代,但一定是很古老的。
I can't date that house exactly, but it must be very old.
2. 他五十多岁,嗯, 确切地说是五十六岁。
He's in his mid-fifties; well, fifty-six to be exact (ie more accurately).
3. 我不能确切地说下周我在什么地方。
I can't say with any certainty where I shall be next week.
4. 这项新产品,确切地说是这种新款式的衬衫,并不是非常吸引人的。
This new product, or rather, this new style of shirt, is not very attractive.