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I'm writing a thank you letter for a professor whose lab I am working in and I play a fairly small role. Although I have a very tiny part, for me the lab is a huge part of my life.

Is there an English saying that describes a small part of the whole? Like a tiny screw in the machine or a walk-on in a play? I was going to go something like "a small keg in the brewery" but I don't know if that makes much sense.

Thanks so much!

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You might use "a small cog in a big wheel" but I'm not sure that's exactly what you're aiming for.

  • Or "a small fish in a big pond". – WS2 Feb 11 at 21:45

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