I can't accept this theory.

Strictly speaking, the theory is not correct.

We associate Darwin with the theory of evolution.

The two theories complementarily explain the phenomenon.

The bases of this theory are still being studied.

The scientist claimed that his theory was infallible.

The theory is widely accepted in the scientific community.

The professor attempted to elucidate the complex theory.

Empiricism is the theory that knowledge is based on experience.

Freud's theories revolutionized the field of psychology.