双周期性 shuāng zhōu qī xìng

DEFINITIONS

  1. (math.) double periodicity

CHARACTERS

双 shuāng
HSK 3
set of two, pair, couple; both
周 zhōu
HSK 3
Zhou dynasty; circumference
期 qī
HSK 1
period of time; date; time limit
性 xìng
HSK 4
nature, character, sex