"Niemand hoort de sterke beer."
Translation:Nobody hears the strong bear.
Normally speaking, (English) bear and (Nederlands) beer (the animal) sound pretty much the same, as do (Eng) beer and (Ned) bier (the drink), but there are always going to be differences in accent.
If you want, you can listen to a native speaker pronouncing these words here:
As far as the voice in this exercise, it sounds like a computer voice, not a human voice.