Microsoft has unveiled a system that can translate what you say into Mandarin and play it back — in your voice. The Google Now personal assistant can tell you if there's a traffic jam on your regular route home and suggest an alternative. Talk to Apple's Siri and she can reschedule an appointment. IBM's Watson supercomputer can field an awkwardly worded question, figure out what you're trying to ask, retrieve the answer and spit it out fast enough to beat human champions on the TV quiz show "Jeopardy!" Computers with that much brainpower increasingly will invade traditional office work.