The braille translator normally automatically removes more than one space between words.
A hard space "forces" space where you intentionally want additional spaces to appear in Braille. DBT will not break lines at hard spaces the way it might at ordinary spaces..
An example of this is where, for ease of reading, you do not want a telephone number to be split over 2 lines.
To insert a Hard Space, place your cursor where you want to have a Hard Space, and press Alt+F2
Please see Layout: Line Codes: Hard Space for more details.