Correct
叩关
/ kòuguān /
Strokes
Definition
to knock at the gate (old)/to make an approach/to invade/to attack the goal (sports)
Example
As a Verb
seek an audience with the monarch of a foreign state
As a Verb
knock at the door
As a Verb
launch an attack upon a fortress
As a Verb
(of football, ice hockey, etc) attack the goal
As a Verb
initiate; launch