I know how you feel, but there's no need to go on and on about it.
我知道你的感受,可是也没必要这样没完没了。
It would help if you could try to speak a little slower.
请你尽量放慢说话速度。
The captain knew that another attempt would be made later, for the sunken ship he was trying to find had been carrying a precious cargo of gold bullion.