The major 'thrust' of their research [=the main reason they are doing their research] will be to find practical applications.
Fame was 'thrust upon' her. [=she became famous even though she did not try or want to be famous]
He 'thrust' his way through the crowd. [=he went through the crowd by pushing people aside]
(..) as a thruster... I can't see you having any control if you did that. You'd be eyeballing the intercept using a thrust vector you can barely control. Yes, those are all very good points. But consider this. I'd get to fly around (..)2015 The Martian
(..) with this many unknowns. It's all right. Um... All models for launch will take days to reach Mars. They vary slightly in thrust duration... And the fuel requirement is nearly identical. Not a good time to launch, is it? Yeah, earth and (..)2015 The Martian