開球

open ball (math.) / to start a ball game / to kick off (soccer) / to tee off (golf)

ball / sphere / globe / CL:個|个[ge4] / ball game / match / CL:場|场[chang3]

to open / to start / to turn on / to boil / to write out (a prescription, check, invoice etc) / to operate (a vehicle) / carat (gold) / abbr. for Kelvin, 開爾文|开尔文[Kai1 er3 wen2] / abbr. for 開本|开本[kai1 ben3], book format