The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

with elementary quantum
MECHANICAL formalism
The Big Bang Theory Season 12, Episode 5

But if you really want to learn
the MECHANICAL side,
The Big Bang Theory Season 10, Episode 15

It was actually just a MECHANICAL hand.
The Big Bang Theory Season 8, Episode 20

whether the accident was due
to MECHANICAL failure or distraction."
Money Heist Season 1, Episode 12

Any chance you've finished up
those MECHANICAL drawings?
The Big Bang Theory Season 11, Episode 16