До сих пор ученные не смогли разгад

До сих пор ученные не смогли разгадать всех загадок Египетских пирамид.

Results (English) 1:

So far scientists have not been able to unravel all the mysteries of the pyramids.

Results (English) 2:

Until now, scientists have not been able to solve all the mysteries of the Egyptian pyramids.

Results (English) 3:

so far, scientists couldn"t solve all the mysteries of the pyramids.