登机证

boarding pass

to scale (a height) / to ascend / to mount / to publish or record / to enter (e.g. in a register) / to press down with the foot / to step or tread on / to put on (shoes or trousers) (dialect) / to be gathered and taken to the threshing ground (old)

to board a plane

(bound form) machine; mechanism / (bound form) aircraft / (bound form) an opportunity / (bound form) crucial point; pivot / (bound form) quick-witted; flexible / (bound form) organic

to admonish / variant of 證|证[zheng4]

certificate / proof / to prove / to demonstrate / to confirm / variant of 症[zheng4]