资料来源 : pyDict

每半年的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Half-yearly \Half"-year`ly\, a.
   Two in a year; semiannual. -- adv. Twice in a year;
   semiannually.

资料来源 : WordNet®

half-yearly
     adv : every half year, every six months