这是个理论。
zhè shì gè lǐlùn.
This is a theory.
理论上可行。
lǐlùn shàng kěxíng.
It's feasible in theory.
别跟我理论。
bié gēn wǒ lǐlùn.
Don't argue with me.
他跟我理论了。
tā gēn wǒ lǐlùn le.
He argued with me.
