hole; opening; orifice (of the human body); (fig.) key (to the solution of a problem)

to open (transitive or intransitive); (of ships, vehicles, troops etc.) to start; to turn on; to put in operation; to operate; to run; to boil; to write out (a prescription, check, invoice etc.); (directional complement) away; off; carat (gold); abbr. for Kelvin, 开尔文; abbr. for 开本, book format

to open; to show (a ticket); to turn on; to switch on

to depart; to leave

to feel happy; to rejoice; to have a great time; to make fun of sb

to begin; beginning; to start; initial

secret; trick; knack; key

a trick; an ingenious method; know-how; the knack (of doing sth)