Girls, How do I ask a lab mate out without compromising our future collaboration and work relationship?

I happen to have a lab mate that I like. We are both Ph. D. students. We are friends. If she was not a member of my lab, I would definitely ask her out. Instead, I fear that, if she turns me down, that might undermine her willingness to collaborate with me in case we both end up doing research.

Girls, How do I ask a lab mate out without compromising our future collaboration and work relationship?
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