That would violate the Pauli Exclusion Principle.

这会违反泡利不相容原理。

This theory is called the Pauli Exclusion Principle.

该理论称为泡利不相容原理。

Electrons are fermions and have to obey the Pauli Exclusion Principle.

电子是费米子，必须遵守泡利不相容原理。