精确的距离是1.838米。

The ___exact distance is 1.838 meters.

恐怕我无法给你确切的细节。

I'm afraid I can't give you ___exact details.

我期待你的下一封信，以便知道你抵达的确切时间。

I am looking forward to your next letter to know the ___exact time of your arrival.