Ambitransitive verb
(重定向自Ambitransitivity)
An ambitransitive verb is a verb that can be intransitive or transitive without requiring a morphological change. That is, the same verb form may or may not require a direct object. English has a large number of ambitransitive verbs. Examples include read, break, and understand (e.g., "I read the book," saying what was read, or just "I read all afternoon").