call on

动词verb

1. 1transitiveTo visit (a person); to pay a call to.
2. 2transitiveTo select (a student in a classroom, etc.) to provide an answer.
3. 3transitiveTo request or ask something of (a person); to select for a task.
4. 4transitiveTo have recourse to.
5. 5ditransitiveTo correct; to point out an error or untruth.