The Ergative Hypothesis distinguishes one of the classes of intransitive verbs—unergative verbs (UV).
格律性假设区分了一类不及物动词的——非作格动词（UV）。
2
The Ergative Hypothesis proposed by Perlmutter (1978) distinguishes two classes of intransitive verbs --- unergative verbs (UV) and ergative verbs (EV).